For a BJT to operate as an amplifier, the base-emitter junction must be forward biased and the base-collector junction must be reverse biased.
Forward biasing the base-emitter junction allows the BJT to conduct current and reverse biasing the base-collector junction allows it to act as an amplifier.
The base-collector junction must be reverse biased for a BJT to operate as an amplifier. Reverse biasing the base-collector junction allows the BJT to act as an amplifier by controlling the current flow between the collector and the emitter.
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T/F When possible, the planning team should build on existing assessments such Hazard Identification and Risk Assessments prepared by the States, major urban areas, and other government entities.
True, the planning team should, if possible, build on previous analyses, such as Hazard Identification and Risk Assessments created by States, significant urban regions, and other governmental bodies.
A continuous urban area (UA) is one that has at least 50,000 residents. It consists of one or more locations—the centre location(s)—and the nearby, densely populated surrounding area, or urban fringe, which is made up of other locations and nonplace territory. All people, homes, and land that are not located in an urban area are referred to as "rural." A census block that satisfies the minimum housing unit density and/or population density standards will constitute an urban area for the 2020 Census. Cities are described with the word urban. There are many people who live and work in cities. Cities are heavily populated commercial centres where leading a fast-paced lifestyle is frequently the norm. Urban areas include places like Atlanta and New York City.
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The classification of an area as being hazardous with regard to the installation of lighting fixtures is the responsibility of the insurance company, authority having jurisdiction, or
The correct answer is owner. The classification of an area as being hazardous with regard to the installation of lighting fixtures is the responsibility of the insurance company, authority having jurisdiction.
In the International System of Units, the lux (symbol: lx) is the unit of illuminance, or light flux per unit area (SI). In terms of lumens per square metre, it is one. This is used in photometry to quantify the amount of light that strikes or penetrates a surface as seen by the human eye. Calculating illumination determines how much light is produced overall by a source. Lumens per square metre, or lux, are used to measure this luminous flux.The entity, position, or person with legal authority to uphold a standard's standards is said to have jurisdiction. The majority of provinces and territories have selected an AHJ as the body in charge of ICS inside their territorial jurisdiction.
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Electronic leak detectors can only be used to detect CFCs.true or false
A leak of less than 0.1 oz per year can be accurately detected in higher end devices using an infrared sensor.
Using this cutting-edge technique, HFCs, CFCs, HCFCs, and HCFC-based refrigerant mixes can be easily recognized. An electronic leak detecting device locates leaks in industrial pipes, steam pipes, oil pipes, drains, water systems, toilets, and other liquid-transporting pipes. An electronic leak detector works on the basis of sound to find leaks in pipes. Explosive gas and carbon monoxide detector. A hybrid alarm that can detect both carbon monoxide and other explosive gases, such methane, propane, and other natural gases, is the best choice for finding dangerous gas leaks.
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Please solve all the problems.
Answer:
1.true
2.false
Explanation:
i hope it's correct
Determine the value of resistor R4 in the given circuit.
Explanation:
which of the following statements about s orbitals in INCORRCT
Answer:
R4 is 1.5 ohm
Explanation:
.if there is no current flowing through R5, there must be no potential difference between a and b.
As such, the ratio of pitentual divider R1/R2 is equal to R4/R3.
A variable power supply is connected to a coil and an ammeter, and the time dependence of the ammeter reading is shown. A nearby coil is connected to a voltmeter.
The resistance for a perfect circuit will be calculated as R= I/V = 6/2 = 2. A variable power supply is one that has several controls that allow the user to quickly change the output voltage and, occasionally, current.
The most common tool for adjustment is a potentiometer, although other tools include analog control voltage, digital input, autotransformer, etc. The measured voltage is the total of the voltages across the ammeter and the resistance, albeit, with a non-ideal ammeter, the ammeter's resistance is not zero. Otherwise known as V>V R, measured voltage (V) is greater than the voltage across the resistor (V R).
As a result, the measured resistance (2) is higher than the real resistance.
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PLTW 1.3.4 Conclusion questions:
1) If you plan to pattern a feature, such as a square hole cut into a solid or a solid extrusion, is it more efficient to pattern the sketch before you extrude or to pattern the final feature after you extrude? Justify your answer.
2) Look around your classroom and think about items in your possession. List at least two objects that could not be modeled efficiently using a straight extrusion but would more efficiently be modeled using a Loft feature. How about objects that could be modeled using a tapered extrusion?
It is more efficient to pattern the sketch before you extrude. This is because when a sketch is patterned before it is extruded, the pattern is created based on the original sketch and the software automatically updates the final feature. If the pattern is applied after the extrusion, the software would have to pattern each individual feature, which would take more time and potentially lead to errors.
2. Two objects that could not be modeled efficiently using a straight extrusion but would more efficiently be modeled using a Loft feature are:
A vase with a tapered shape that widens at the top and narrows at the bottom.A lampshade with a curved shape that flares out at the bottom and narrows at the top.What is the object about?By patterning the sketch before extruding, the software can quickly and easily apply the pattern to the final feature.
Objects that could be modeled using a tapered extrusion are:
A bottle with a tapered shape that widens at the bottom and narrows at the top.A pencil with a tapered shape that widens at the top and narrows at the bottom.Therefore, In both cases, the tapered extrusion feature allows for easy creation of tapered shapes, which would be more difficult to model using other features such as straight extrusions or lofts.
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The video of the Titanic sinking shows that the ship broke into two parts. Why do you think that this happened
When the Titanic struck the iceberg, the hull plates split open and continued to crack as the ship was flooded. Brittle failure of the rivets used to fasten the hull plates to the ship's main structure was also caused by low water temperatures and high impact loading.
What is the history of Titanic?The RMS Titanic was a British passenger liner operated by the White Star Line that sank in the North Atlantic Ocean on 15 April 1912 after colliding with an iceberg during her maiden voyage from Southampton, England, to New York City, USA.
More than 1,500 people died, making it the deadliest sinking of a single ship to that point. It is still the deadliest ocean liner or cruise ship sinking in peacetime.
The disaster drew widespread public attention, laid the groundwork for the disaster film genre, and inspired numerous artistic works. The RMS Titanic was the largest ship in the world when she entered service, and she was the second of three Olympic-class ocean liners operated by the White Star Line.
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When the lightning (electric current) hit the cage that Bill Nye was in, it turned the cage in to a kind of... *
Dams harness the power of falling water to generate electricity for residential use.
When the bass is loud enough, the sound energy transforms into kinetic energy, making the floor move. A portion of the energy that changes forms always escapes as heat. When you turn on the electricity and the lamp, it occurs. There are six different types of energy: nuclear, chemical, electric, radiant, and mechanical. Various searches might turn up mentions of other kinds, such electrochemical, acoustic, and electromagnetic. The primary source of energy for the production of electricity is fossil fuels. Electrons are drawn to or pushed away by a moving magnetic field. The electrons in metals like copper and aluminium are slackly held. Electrons are forced into the wire and produce an electric current when a magnet is rotated around a coil of wire or the other way around.
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which kind of pump is generally used for moving grease, mastic, concrete, and other nearly solid materials?
A cell's plasma membrane acts as a barrier that is selectively permeable, controlling the movement of molecules, ions, and other substances from the cell's exterior to its interior.
What does mean when somebody is selective ?When someone is choosy, they carefully select their actions and purchases, for instance. Sales still take place, but purchasers are pickier now. Synonyms: specific, strict, picky, and judgmental Additional Synonyms for select.
The definition of selective knowledgeIf partial knowledge acknowledges that we must address a problem with incomplete facts, selective knowledge discusses the deliberate decision to reject, select, then accept based on need, desire, or expectation up until a story is revealed.
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You want to implement a fault tolerance topology as you connect routers on your wide area network. Which of the following topologies meet your needs ?
Redundancy for a broken link is provided via mesh network topologies. Network topology can be used to define or describe a variety of telecommunication networks
The topology of a communication network describes how its elements are set up. Network topology can be used to define or describe a variety of telecommunication networks, including industrial fieldbuses, computer networks, and command and control radio networks. Studying network topology allows one to recognize the eight basic topologies that include point-to-point, bus, star, ring or circular, mesh, tree, hybrid, and daisy chain. The star, mesh, tree, ring, point-to-point, circular, hybrid, and bus topologies are a few examples of physical network topologies. These networks are made up of various configurations of nodes and linkages. Studying network topology allows one to recognize the eight basic topologies which include point-to-point, bus, star, ring or circular, mesh, tree, hybrid, and daisy chain.
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Tech A says that after an accident you should take measures to avoid it in the future. Tech B says that it is okay to block an exit for a shop if you are actively working. Who is correct
Technician A is the appropriate response based on the information provided in the question.
How would you define measures?the quantity or size of something as determined by measurement. use equal amounts of the ingredients.: a yardstick, cup, or other measuring device.: a measurement unit. A foot is used to measure length.
What are basic steps?The measurement that just employs one kind of unit is considered to be simple. minutes and hours. For instance, to convert 2 hours, 23 minutes, and 12 seconds to seconds, we must first get all 3 parameters in seconds using the conversion factors, then add them.
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Electric heating equipment is typically.A.) Less expensive to purchase and less expensive to operate than fossil fuel heating equipment.
B.) More expensive to purchase and more expensive to operate than fossil fuel heating equipment.
C.) More expensive to purchase and less expensive to operate than fossil fuel heating equipment.
D.) Less Expensive to purchase and more expensive to operate than fossil fuel heating equipment.
Usually, electric heaters are used. Compared to fossil fuel heating equipment, it is more affordable to buy but more expensive to run.
Any type of biologically derived hydrocarbon-containing fuel that is found in the Earth's crust and can be used as an energy source is referred to as a fossil fuel.
Oil shales, bitumen, tar sands, and heavy oils are examples of fossil fuels along with coal, petroleum, natural gas, and petroleum. All of them include carbon and were created by geologic processes acting on the remains of organic matter produced by photosynthesis, a process that started in the Archean Eon (4.0 billion to 2.5 billion years ago). Before the Devonian Period (419.2 to 358.9 million years ago), the majority of carbonaceous material came from bacteria and algae, but the majority of carbonaceous material that formed during and after that time came from plants.
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A machine instruction Test-Set-Branch, TSB(x, L), where x is a memory location and L is a branch label, performs the following function in one instruction cycle:
if (x <== 0)branch to L else x = 0
Implement the Pb and Vb operations on binary semaphore using TSB ?
Binary semaphores are synchronization troglodytes that are used to safeguard shared resources and concurrent systems. They are implemented using the P (proberen) or V (verhogen) operations.,
What are the purposes of semaphores?Semaphores are widely used to synchronize access to resources. The initial semaphore count is set to the quantity of available resources. The counter is then atomic scale raised when new resources are provided and lowered when old resources are removed by threads.
What kind of signal is a semaphore?One of two methods is commonly employed with semaphores: between jobs, to limit the use of a common device. A excellent illustration is a printer. You build a binary because you don't want to send two tasks to the printing at once.
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The flat belts are moving at the speeds shown. Plot both the velocity profile within the oil film and the shearstress distribution. The pressures at A and B are atmospheric. Take mo
Shear stress values and the velocity profile are v=0.4m/s,
t=45 N/m^ 2
Explanation:
A) Velocity profile=0.6m/s, and 0.2m/s
relative velocity=0.6m/s-0.2m/s
v=0.4m/s
∵ thickness=4 mm
t=4x10^ -3m
B) Shear stress t=R v/t
=0.45x0.4/4x10^-3
t=45 N/m^ 2
Shear velocity, also known as friction velocity, is a way to express a shear stress in velocity units. Comparing actual speeds, like the flow in a stream, to ones that reflect shear between layers of flow is a useful technique in fluid mechanics.
Due to its close connection to earthquakes and the downslope movement of earth materials, the resulting shear has a significant impact on nature. Either solids or liquids can experience shear stress.
Using equation, one can determine the shear velocity.
U*= √r/p in the general case.
INCOMPLETE QUESTION:
The flat belts are moving at the speeds shown. Plot both the velocity profile within the oil film and the shear stress distribution. The pressures at A and B are atmospheric. Take u^0=0.45N.s/m2 and P^0=920KG/M3
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.
You have been hired by a homeowner to install a ceiling fan and light kit in a living room. The living room luminaire (light fixture) being used at the present time contains two 60-W lamps. After locating the circuit in the panel box, you find that the circuit is protected by a 15-A circuit breaker and is run with 2.5mm² copper wire. After turning on all lights connected to this circuit, you have a current draw of 8.6 A and a voltage of 120V. The ceiling fan light kit contains four 60-W lamps, and the fan has a maximum current draw of 1.6 A. Can this fan be connected to the existing living room circuit? Recall that a continuous-use circuit should not be loaded to more than 80% of its rated capacity.
Answer:
No, you cannot add the ceiling fan to the circuit.
Explanation:
120V/60W=0.5A (V/W=A)
0.5A*4=2A (you have 4 60W lamps)
2A+1.6A=3.6A
3.6Ax0.125=0.45A (continuous load appliances must have amperage rated at 125% according to USA NFPA 70)
0.45A+3.6A=4.05A
4.05A+8.6A=12.65A
Assuming all devices on the circuit are ON, there would be a total current draw of 12.65A (after adding the ceiling fan). 80% of 15A is 12A.
Consider the external ports for a typical PC system (pictured below). Drag the port type on the left to the letter on the right that best identifies it. (Each type can be used once.)
Thunderbolt, A-HDMI, B-IEEE 1394, C-USB, E-VGA, F-DVI, G-RJ45, H-RJ11, I-Fiber, S/PDIF, and J-Audio Jack.
There are three distinct types of expansion slots shown in this image: PCI Express, PCI, and AGP. PCI Express: Also known as PCIe, PCI Express is the ideal sort of expansion slot to have in your computer. A USB port is used to connect a wired mouse to a contemporary computer. In light of this, a modern PC uses the USB port on its back to connect a mouse, making USB the right response. Signals for visual and audio can be sent via DisplayPort over the same connection.
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you approach a ravine with two i-beams. how do you know if you can cross (explain using equations, engineering concepts, etc.)?
To determine if you can safely cross a ravine with two I-beams, you will need to calculate the maximum allowable span of the I-beams. This can be done by first determining the dead load and live load on each beam, and then using a span-to-depth ratio to calculate the maximum allowable span.
The dead load is the weight of the beams themselves and any permanent loads that are attached to the beams, such as a deck or guardrail. The live load is the weight of any temporary loads, such as people or materials, that will be placed on the beams. Once the dead load and live load are known, the maximum allowable span can be calculated using a span-to-depth ratio.
This ratio is typically determined by the type of I-beam being used, the material of the beam, and the expected environmental conditions. For example, if the I-beam being used is made of steel and is expected to be subjected to wind loads, the span-to-depth ratio might be 6 to 1. This means that for every 6 feet of span, the beam must be at least 1 foot deep.
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which type of roofing material develops its design strength when it is placed into forms and then hardens at the building site?
Cast-in-place concrete is the type of roofing material develops its design strength when it is placed into forms and then hardens at the building site.
Roofing material is an outer layer on our roof that helps the building from rains and thunderstorms etc. There are many types of roofing materials on the market. You can choose any material of your choice like metal shingles, wood shingles and clay tiles etc. Cast-in-place concrete is poured onsite in the finished concrete position. This differs from precast concrete where the slabs are built somewhere else and when they get ready, they are shifted the site and assembled as needed.
Considering a more durable or modern roofing material is recommended. Appearance, durability, price of the roofing material, and structural issues should be considered to select the right type of roofing material.
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A supplementary grounding electrode is required when the only grounding electrode available is ? NEC Reference?
A supplementary grounding electrode is required when the only grounding electrode available is a metal underground water pipe.
What is grounding electrode?A grounding electrode basically establishes a direct connection to the earth or ground by being conductive. A grounding electrode's direct contact with the ground is what matters. In spite of the fact that a structure contains many conductive items, not all of them directly connect to ground. The grounding electrode system here starts to take shape.
If any of the listed items are present, they must be used to create the grounding electrode system, according to the NEC, which contains a list of items that are allowed to be used as grounding electrodes. As permitted grounding electrodes, there are eight items listed in 250.52.
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Q. 1. A sedimentation basin is to be designed so that it will remove 100% of all particles which have a settling velocity of 0.3 mm/s.
(a) For a flow of 10 m3/min, determine appropriate dimensions for a rectangular basin in which the length is 4 times the width.
(b) Determine the total weir length required.
Show in sketches.
Q. 2. Describe the effect you would expect with regard to solids removal if the basin of the Prob. Q. 1 was kept at a detention time of 2 h but made only half as deep. Why would this effect occur? What other factors might influence your choice of basin depth?
Answer:
he k do it ur go u is a little bit of time v be
Energy band model a) For silicon, if Eg decreases by 0.078 eV, by what fraction does ni increase (assume T is constant at 300K)? b) If the temperature rises from 300K to 600K, by what additional fraction does n, increase (assume Eg is constant 1.068 eV, you do not need to worry about the decrease from problem a)? c) If we further increase the temperature, Si starts exhibiting semi-metal properties. Think ofa physical reason for this phenomenon.
Plotting the accessible energies for an electron in a material allows band theory to assist visualise the differences between a conductor, semiconductor, and an insulator.
Why is energy band important?It is essential for this course to understand how to read and sketch the energy band model, also known as the band diagram, which is used throughout the book to explain how electrons and holes respond to external factors like as light, heat, and/or voltage.
The knowledge amassed during the scientific quantum revolution contributed in certain ways to the development of band theory. Felix Bloch came up with the concept of using solids as examples for the quantum theory in 1928. Bands—extremely tightly spaced orbitals with minimally different energies—were discovered by Walter Heitler and Fritz London in 1927.
Plotting the accessible energies for an electron in a material allows band theory to assist visualise the differences between a conductor, semiconductor, and an insulator.
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a feeder circuit with no motor load has a continuous load of 10a and a noncontinuous load of 10a. the feeder overcurrent protective device should be sized at ?
The feed overload protective device should have a size of 11.25A based on the information provided in the inquiry.
What is a circuit's straightforward definition?A circuit in electronics is a full circular channel via which electricity flows. A simple circuit entails a current source, wires, and a load. The term "circuit" can broadly be used to describe any ongoing path via which electrical, data, or a transmission might go.
Which four types of circuits are there?Closed circuit, current in the circuit, short - circuits, main design, and parallel circuit are the main varieties of electric circuits. The movement of electrical charges or current has a conductive channel thanks to electric circuits.
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Which part should be tested? O Flame sensorO Expansion valve O Solenoid valve O Gas valve
The correct response is a. Flame sensor. Flame sensor should be tested.
The flame sensor, which is a brief, thin metallic rod, generates a modest electrical current to signal whether a flame is burning inside the furnace. The current moves from the sensor to detect the heat from a flame as the gas valve opens to initiate combustion. An essential safety component of your gas heating system is a flame sensor. Your gas furnace will really ignite the gas during the ignition cycle using a spark or a hot surface ignitor. A current of electricity is produced by the flame sensor as the gas is ignited. If your furnace doesn't have a flame sensor, it will continue to release gas even when nothing is there to ignite it, which can lead to dangerous gas accumulation.
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You have been asked to install a network cable inside a conduit that will be placed underground and used to connect two buildings that are located about 1 KM apart. Which of the following cable types should you choose
The correct answer is fiber You have been asked to install a network cable inside a conduit that will be placed underground and used to connect two buildings that are located about 1 KM apart.
Fiber optic cables come in single-mode and multimode varieties. Due to its diverse optical characteristics in the core, multimode optical fibre, also known as OFC, is able to transmit many light beams (modes) at once. The core size of single-mode fibre is substantially smaller (9 microns). There are two "modes" of fibre optic cable: multimode and singlemode. Mode describes the number of pulses or the single pulse of light. There are two core sizes for multimode fibre (MMF): 50 m and 62.5 m. Fiber-optic access options for residential deployments are part of FTTH. Fibers are directly linked to specific residences or multi-tenant buildings in FTTH networks.
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Equipment such as phones, fax machines, and computers are all examples of the_____ element of the business environment.
The equipment aspect of the corporate environment is exemplified by tools like phones, fax machines, and computers.
Equipment includes items like computers, vehicles, and processing equipment. They are tangible because they have a physical form, as opposed to intangible assets, which don't (such patents, trademarks, or copyrights), which are the things required for a specific activity or purpose. When we say "the set of goods you require for a certain function," we mean "the uncountable noun equipment," such as tools or clothing: New sleeping bags and a small refrigerator are among the camping supplies we've purchased. They are the most fundamental methods for employing leverage (or mechanical advantage) to increase force that are currently understood. Simple machines include the wheel and axle, inclined plane, lever, wedge, pulley, and screw basic machines
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Chapter 9 hand tools
Any tool that is powered by the user's hands as opposed to a motor is a hand tool.
What are hand tools?Any tool that is powered by hand rather than a motor is referred to as a hand tool.
Wrenches, pliers, cutters, files, striking tools, struck or hammered tools, screwdrivers, vises, clamps, snips, hacksaws, drills, and knives are examples of different types of hand tools.
It should be noted that classifying hand tools according to its function is important because it will provide the user with enough knowledge to be able to use the hand tools.
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Complete question
Explain hand tools
A television news director wishes to use 3 news stories on an evening show. One story
will be the lead story, one will be the second story, and the last will be a closing story. If
the director has a total of 8 stories to choose from, how many possible ways can the
program be set up?
Answer:
336 ways
Explanation:
Write 5-6 lines of code to open a PrintWriter and write out the contents of the plants array into a text file named plants.txt
Here's an example of how you might open a PrintWriter and write out the contents of the plants array into a text file named plants.txt in Java:
String[] plants = {"Rose", "Tulip", "Lily", "Sunflower"};
PrintWriter writer = new PrintWriter("plants.txt", "UTF-8");
for (String plant : plants) {
writer.println(plant);
}
writer.close();
Here's an example of how you might open a PrintWriter and write out the contents of the plants array into a text file named plants.txt in Python:
plants = ["Rose", "Tulip", "Lily", "Sunflower"]
with open("plants.txt", "w") as file:
for plant in plants:
file.write(plant + "\n")
Please note that in Python, the "w" mode of the open function will truncate the file if it already exists and create a new one if it does not.
You can also use the append mode to add the new data to the existing file.
with open("plants.txt", "a") as file:
for plant in plants:
file.write(plant + "\n")
You can also use the writelines method to write out the contents of the plants array into the text file.
with open("plants.txt", "w") as file:
file.writelines("\n".join(plants))
Please note that the above code examples will create the text file in the same directory where the code is running. If you want to save the file in a specific directory, you will have to provide the full path of the directory in the filename.
Empty disposable R-134a refrigerant containers should be: a. disposed of according to SAE J2196. b. evacuated into a recovery/recycling machinec. flushed with R-152a refrigerantd. flushed with R-134a refrigerant.
Vacuum into a recovery/recycling machine, empty disposable R-134a refrigerant containers should be disposed of.
An area devoid of the matter is called a vacuum. The adjective vacuum, which means "empty" or "void," is the source of the word. A region with a gaseous pressure significantly below atmospheric pressure might be thought of as an approximate representation of such a vacuum. The term "partial vacuum" is used to describe an imperfect vacuum, such as one that might exist in a laboratory or in space, and is frequently used when physicists discuss the ideal test outcomes that would take place in a perfect vacuum, which they sometimes simply refer to as "vacuum" or free space. Contrarily, any area where the pressure is significantly lower than atmospheric pressure is referred to as a vacuum in engineering and applied physics. A space that envelops an object is referred to as being in vacuo in Latin.
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