The frequency (in reciprocal seconds) of electromagnetic radiation with a wavelength of 1.15 cm is 0.005x[tex]10^{-8}[/tex]Hz.
What do you mean by frequency?The frequency of a repeated event is its number of the instances per unit of time. In some cases, it is also referred to as the temporal frequency or ordinary frequency to underline the differences with spatial and angular frequencies, respectively. One (event) per second is equal to the one hertz (Hz), which is how frequency is stated. The period is the reciprocal of frequency since it is the length of time for one cycle in a repeating occurrence.
The temporal rate of change observed in oscillatory and periodic phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light, is specified by frequency, an essential parameter in science and engineering.
The main formula is
L = V / F so F= V/L
L= wavelength = 1.15 cm=0.015m
V= speed of the light=3 x [tex]10^{8}[/tex] m/s
finally,
F= 0.015/3x10^8=0.005 x[tex]10^{-8}[/tex] Hz
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PLEASE HELP!! 10 points!!
Describe how you would measure 50ml of hydrochloric acid out?
Explanation:
to prepare it you would a quantity of 300ml of distilled water to a volumetric flask I think?
Identify the number of significant figures in the examples below. Use numbers, not words, to fill in the blanks.
The significant figure in the numbers are as follows:
1.06 s has 3 significant figures5003 mL has 4 significant figures10890 kg has 5 significant figures50 students has 1 significant figures0.00001 m has 1 significant figures100.0 cm² has 1 significant figures0.00800 s has 1 significant figuresWhat are significant figures?Significant figures refers to digits which are non-zeroes found in a given number. Also, if zeroes are found between non-zero digits, the zeroes are counted as significant numbers.
The number of non-zero digits gives the number of significant figures in a number.
Significant figures are used in approximating values to determine to how many places the digits in a number are significant.
Considering the given numbers:
A) 1.06 s has 3 sig figs
B) 5003 mL has 4 sig figs
C) 10890 kg has 4 sig figs
D) 50 students has 1 sig figs
E) 0.00001 m has 1 sig figs
F) 100.0 cm² has 1 sig figs
G) 0.00800 s has 1 sig figs
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Question 1
2 pts
How many significant digits are in this
0.0023 cm x 28.6 cm x 180.3 cm
Carrie measured mass and another property, X, of three pure samples of the same compound. She recorded her data in the table.
Which of the following best describes property X?
The statement which best describes property X is: C. X is an extensive property because it varies directly with the size of the sample.
What is a physical property?A physical property can be defined as the properties of an object that can be measured and observed without changing (altering) the chemical composition of the object.
The types of physical property.In Chemistry, there are two (2) main types of physical property and these include the following:
Extensive property: it is a property that changes when the size of an object changes.Intensive property: it is a property that remains the same regardless of the change in the size of an object.In this context, we can reasonably infer and logically deduce that X is an extensive property because it varies (changes) directly with the size (mass) of the sample.
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Complete Question:
Carrie measured mass and another property, X, of three pure samples of the same compound. She recorded her data in the table. Which of the following best describes property X?
A. X is an intensive property because it does not vary with the size of the sample.
B. X is an extensive property because it does not vary with the size of the sample.
C. X is an extensive property because it varies directly with the size of the sample.
D. X is an intensive property because it varies directly with the size of the sample.
The subatomic particles of an element are very important to that element and affect an element each in it's own way.
What are the three subatomic particles of an atom and what are their respective charges? If I wanted to figure out how to find the number of nuetrons, how could I use the atomic mass to find it?
Answer:
Explanation:
The three subatomic particles: protons with a positive charge, neutrons with a neutral charge, and electrons with a negative charge. The atomic mass can be found by adding the amount of protons and the amount of neutrons together. Therefore, you can find the number of neutrons in an atom by subtracting the number of protons from the atomic mass.
How fast do Plate Boundaries move and how do scientists figure out how fast they go and which directions do they go?
Plate boundaries can move as fast as 1 cm to over 10 cm per year and the scientists figure out how fast they go and which directions do they go through the use of GPS.
What is GPS?This is referred to as Global positioning system and it contains different types of satellites which makes it easier to determine the ground position of different types of objects such as plate boundaries, rocks etc.
This system sends highly accurate navigation pulses to users thereby ensuring that the exact position is gotten and in the case of the plate tectonics people use it to determine the extent of movement within a given period of time.
Plate tectonics move slowly which varies and is usually between 1 cm to over 10 cm per year thereby making it the most appropriate choice.
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How many MOLES of sulfur
hexafluoride are present in
8.50x1022 molecules of this
compound ?
ii) Which arrow shows the direction of the force of the spring on the ball? Tick the correct box
Answer:
b
Explanation:
i just randomly give the answer because of the reason you didn't gave the example
Please with this on the image
Answer:
neutron
electron
13
atomic number/proton number
(answers are in order)
matter can change phase by changing the amount of?
Answer:
Explanation:
Matter can change phase by changing the amount of Energy
which of the following statements are true about this reaction
The statements a b c and d are false. Option B
What is a redox reaction?The term redox reaction refers to a type of reaction in which there is a simultaneous oxidation and reduction of species in the reaction. This implies that one specie accepts electrons and one specie losses electrons. The whole process occurs simultaneously in the reaction.
If wee look at the reaction we can see that chloride ion was oxidized to chlorine gas and the chromate VI was reduced to chromate III. the oxidation number of hydrogen and oxygen remained the same on both sides hence the statements a b c and d are false. Option B
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Oxygen gas reacts with solid carbon to produce carbon dioxide gas . Write a balanced chemical equation for this reaction.
The balanced chemical equation is O₂ (g) + C (s) → CO₂ (g).
The chemical element carbon has the atomic number six and the letter C assigned to it. It has a tetravalent atom, which means that four of its electrons can be used to create covalent chemical bonds. It is nonmetallic.
When carbon combines with oxygen gas to generate carbon dioxide gas, the balanced equation is as follows:
O₂ (g) + C (s) → CO₂ (g)
While oxygen is a gas and has the chemical symbol O, carbon is a solid element with the symbol C.
Carbon dioxide gas is created when carbon combines with oxygen gas as follows:
O₂ (g) + C (s) → CO₂ (g)
According to the equation above, each element in the equation has an equal amount of atoms, hence the equation is said to be balanced.
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22. Which of the following hydrated salts is used to remove permanent hardness in water? A. CaSO4.H₂O B. MgSO4.7H₂O C. Na₂CO3.10H₂O D. Na₂SO4.10H₂O
The hydrated salts which is used to remove permanent hardness in water is Na₂CO3.10H₂O.
The presence of soluble bicarbonates, chlorides, and sulphates of calcium and magnesium is what causes water to be hard. Hard water is water that does not foam up with soap.There are several minerals in hard water. It is created when water seeps through chalk and limestone formations, which are composed of magnesium and calcium carbonates. It cannot be used for laundry since it does not produce a lather when soap is added. Presence of soluble magnesium and calcium salts in the form of chlorides and sulphides in water as permanent hardness since boiling cannot dissolve this hardness.By adding washing soda to the water, we can soften it up. When washing soda combines with the sulphide and chloride compounds of calcium and magnesium, insoluble carbonates are created, resulting in the transformation of hard water into soft water.Therefore, Na₂CO3.10H₂O is used to remove permanent hardness in water.
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7. Water has a low viscosity (thickness). How might the movement of other dyes change if a fluid with a higher viscosity is used?
The movement of other dyes greatly change if a fluid with a higher viscosity is used because viscosity controls the movement of particles.
How might the movement of other dyes change if a fluid with a higher viscosity is used?The movement of other dyes change if a fluid with a higher viscosity is used because viscosity decides the movement of materials. Viscosity is defined as a measure of resistance of a fluid to flow. Those liquids that have higher viscosity having slower movement of particles while on the other hand, those liquids that have lower viscosity having faster movement of particles. The dyes present in the liquid moves slower due to higher viscosity of the liquid whereas dyes present in the liquid moves faster due to less viscosity of the liquid.
So we can conclude that the movement of other dyes greatly change if a fluid with a higher viscosity is used because viscosity controls the movement of particles.
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acmillan Learning
What is the maximum mass of Sg that can be produced by combining 90.0 g of each reactant?
8 SO₂ + 16H₂S3Sg
+ 16H₂O
The maximum mass of Sg that can be produced by combining 90.0 g of each reactant is 130g. It is due to the reason that the H2S is limiting agent and thus limits the amount of product that can be produced.
8 SO₂ + 16H₂S ==> 3Sg+ 16H₂O
What is the calculation of the given problem?According to this, 3 moles of S8 will be created when 8 moles of SO2 and 16 moles of H2S are combined. To calculate the maximum quantity of S8 that can be created, we must figure out how many moles of SO2 and H2S are actually present throughout this process. Which reactant, in other words, is contained in the limited supply? Let's look at the balanced equation:
8SO2 + 16H2S ==> 3S8 + 16H2O
For SO2: 92.0 g SO2 x 1 mol SO2/64.1g x 3 mol S8/8 mol H2S x 257 g S8/mol S8 = 138 g S8 formed
For H2S: 92.0 g H2S x 1 mol H2S/34.1 g x 3 mol S8/16 mol H2S x 257 g S8/mol S8 = 130. g S8 formed
So, the maximum amount of S8 that can be formed would be 130g.
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A student decided not to reweigh his Erlenmeyer flask throughout the calibration lab. After a given trial, he shook leftover water out of his Erlenmeyer flask by wrist action and assumed the mass of his flask was constant. Then, he reused the flask for the next trial and so on. Given this information, how might this affect the student's calibration graph (i.e., explain what the graph might look like)? Is this an example of random or systematic error? Why? Since the buret calibration graph is used to adjust apparent delivered volumes in future labs, how will this student's laziness affect his future data?
The laziness of student can affect calibration in many ways. Such situations leads to errors in the experiment.
The given case could lead to standard deviations that are so high that they endanger the calibration.Different operators may generate measurements with biases that vary in sign and magnitude.It can lead to incorrect plotting of graph.The mistake done by student is an example of systematic error. Systematic Error: Incorrectly calibrated or improperly used measuring equipment is typically the root cause of systematic error. However, errors can enter your experiment from different means. As student doesn't reweigh his Erlenmeyer flask throughout the calibration lab so this comes under improper handling of equipment. therefore, it is systematic error. Student's laziness will affect his data which he will use as reference in future for further experiments.There will be huge error in calibration graph which will lead to incorrect adjustments of volumes in labs.
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how does the doppler effect explain why a seiren pitch increases as it approches you
A siren pitch increases as it approaches us, as according to Doppler effect pitch depends on the frequency of the sound wave. A high frequency corresponds to a high pitch, so when the siren approaches us the observed frequency increases and our ears hears a higher pitch as siren produces waves of constant frequency as it approaches us .
We know,
Doppler effect is the apparent change in frequency of a wave when the observer and the source of the wave move relative to each other.
According to Doppler effect, frequency of sound, light or other waves increases due to relative motion between wave source and observer. The frequency increases if the source and the observer move towards each other and vice-versa.
Since the observed frequency increases when the siren produced waves of constant frequency our ears hears a higher pitch as it approaches us.
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are both of these answers correct?
The one that will increase the rate of reaction can be adding a catalyst, proper reactant concentration, pH, temperature, etc. And the exothermic reaction is the one that gives off energy to the environment. The correct option for question 1 is E and for 2 is E.
What is rate of reaction?The reaction rate or rate of reaction is the rate at which a chemical reaction occurs, defined as proportional to the increase in product concentration per unit time and the decrease in reactant concentration per unit time. The rates of reaction can differ tremendously.
Adding a catalyst, proper reactant concentration, pH, temperature, and so on can all increase the rate of the reaction.
The exothermic reaction is the one that usually releases energy into the environment.
Thus, the correct options for question 1 and 2 is E and E respectively.
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EXPLAIN All three balloons have the same volume even though the gases contained in
the balloons are different. Explain why you think this is possible.
en lo a
360 mw
lios asbineq
9700 10 em
aro
According to Avogadro’s law, the three balloons, although have different gases, have the same volume.
Avogadro’s law states that gas molecules at STP occupy 22.4L volume.
According to Avogadro's law, all gases have the same molar volumes at a certain temperature and pressure. As a result, even if we are unsure of the type of gas we are working with, we can still determine how much material is there.
According to Avogadro's law, if we double the volume by a certain factor, let's say x, we must likewise multiply the substance amount by x. This kind of connection is referred to as direct proportionality and can be formally stated as V ∝ n.
At Standard Temperature and Pressure (STP), i.e., 0℃ and 1atm pressure, gases like hydrogen, oxygen and carbon dioxide have a molar volume of 22.4L.
Avogadro’s law suggests that equal volumes of gases contain equal number of molecules at STP.
Therefore, 1 mol of [tex]O_2[/tex] = 1 mol of [tex]H_2[/tex] = 1 mol of [tex]CO_2[/tex] = 22.4L
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A 35.0 mL solution of NaOH is neutralized with 22.7 mL of 0.250 M HCl. What is the concentration of the original NaOH solution?
The concentration of the base is 0.162 M
What is the concentration of NaOH?We know that neutralization is a reaction in which an acid is reacted with a base to yield salt and water only. The first step is to write down the equation of the reaction as follows;
[tex]NaOH + HCl ----- > NaCl +H_{2} O[/tex]
Now using the formula;
CAVA/CBVB = NA/NB
CA = concentration of acid
CB = concentration of base
VA = volume of acid
VB = volume of base
NA = number of moles of acid
NB = number of moles of base
CAVANB = CBVBNA
CB = CAVANB/VBNA
CB = 0.250 M * 22.7 mL * 1/35.0 mL * 1
CB = 0.162 M
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Predict what kind of chemical bond forms between nitrogen and hydrogen atoms in
ammonia (NH3).
Answer:
Nitrogen atoms and hydrogen atoms in ammonia are held together by covalent bonds.
Explanation:
Calculate the amount of copper (in moles) in a 35.8-g pure copper sheet.
Express your answer numerically in moles.
The amount of copper (in moles) in a 35.8-g pure copper sheet = 0.564 moles.
Given:
Mass = 35.8 g
Molar mass of copper = 63.5 g/mol
It home contains copper, a lovely and practical metallic element, both in its pure form and as chemical compounds. The International System of Units uses the mole (symbol: mol) as the unit of material quantity (SI). The amount of a substance determines how many elementary entities of that substance are present in an object or sample.
Moles can be calculated using the formula:
Number of moles = Mass/ Molar mass
Putting values in above equation, we get
Number of moles = 35.8 g / 63.5 g/mol
Number of moles = 0.564 moles
So, The amount of copper (in moles) in a 35.8-g pure copper sheet = 0.564 moles.
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Combustion analysis of an unknown compound containing only carbon and hydrogen produced 4.554 g of CO2 and 2.322 g of H2O. What is the empirical formula of the compound?
The empirical formula is C₂H₅.
Oxygen is used to burn a chemical during a combustion reaction. The products will be CO₂ and H₂O if the chemical comprises C and H. The products are the same if the compound additionally contains o, but less external O₂ is required for combustion. The same methodology is used to get the empirical formula: we measure the amount of CO and H₂O produced and work backward to determine the moles of C and H (and O by difference if that is the case).
The products are 4.554 g of CO₂ and 2.332 g of H₂O :
The amount of C in moles is:
= 4.554 g CO₂ × ( 1 mol CO₂ / 44.01 g ) × ( 1 mol C / 1 mol CO₂ )
= 0.1035 mol C
Similarly,
2.332 g H₂O × ( 1 mol H₂O / 18.02 g ) × ( 2 mol H / 1 mol H₂O ) = 0.2578 H
From the combustion of the compound, we obtained all the carbon and hydrogen. Hence, the ratios are:
C : ( 0.1035 / 0.1035 ) = 1
H : (0.2578 / 0.1035 ) = 2.49
Therefore, CH₂.₅
When we multiply CH₂.₅ by 2, we get C₂H₅.
The empirical formula of the compound is C₂H₅.
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How many atoms or ions of each element are in 174.2 g of the following substances? (a) BaSO4
(b) Mg3(PO4)2
c) O2
d0 KBr
The number of atoms of each elements that are in 174.2g of the following substances are:
(a) [tex]BaSO_{4}[/tex]⁴= 4.49 × 10²³ atoms
(b) [tex]Mg_{3} (PO_{4} )_{2}[/tex] = 4.0 × 10²³ atoms
(c) [tex]O_{2}[/tex] = 65.5 × 10²³ atoms
(d) KBr = 8.81 × 10²³ atoms
Calculation of number of atomsFor the compound [tex]BaSO_{4}[/tex];
The molar mass of [tex]BaSO_{4}[/tex]= 233.38 g/mol
According to Avogadro's number: 6.02x1023 atoms = 1 mol
Therefore, 233.38 g of [tex]BaSO_{4}[/tex]= 6.02x10²³ atoms
174.2 g of [tex]BaSO_{4}[/tex]= x atoms
Make x atoms the subject of formula,
X atoms = 174.2 × 6.02x10²³/ 233.38
X atoms= 1048.684 × 10²³/233.38
X atoms = 4.49 × 10²³ atoms
For the compound[tex]Mg_{3} (PO_{4} )_{2}[/tex] ;The molar mass of [tex]Mg_{3} (PO_{4} )_{2}[/tex]= 262.855 g/mol
According to Avogadro's number:
6.02x1023 atoms = 1 mol
Therefore, 262.855 g of [tex]Mg_{3} (PO_{4} )_{2}[/tex] = 6.02x10²³ atoms
174.2 g of [tex]Mg_{3} (PO_{4} )_{2}[/tex] = x atoms
Make x atoms the subject of formula,
X atoms = 174.2 × 6.02x10²³/ 262.855
X atoms= 1048.684 × 10²³/262.855
X atoms = 4.0 × 10²³ atoms
For the compound [tex]O_{2}[/tex];
The molar mass of [tex]O_{2}[/tex]= 16 g/mol
According to Avogadro's number:
6.02x1023 atoms = 1 mol
Therefore, 16 g of [tex]O_{2}[/tex]= 6.02x10²³ atoms
174.2 g of [tex]O_{2}[/tex] = x atoms
Make x atoms the subject of formula,
X atoms = 174.2 × 6.02x10²³/ 16
X atoms= 1048.684 × 10²³/16
X atoms = 65.5 × 10²³ atoms
For the compound KBr;
The molar mass of KBr = 119.002 g/mol
According to Avogadro's number:6.02x1023 atoms = 1 mol
Therefore, 119.002 g of KBr = 6.02x10²³ atoms
174.2 g of KBr = x atoms
Make x atoms the subject of formula,
X atoms = 174.2 × 6.02x10²³/ 119.002 g
X atoms= 1048.684 × 10²³/ 119.002 g
X atoms = 8.81 × 10²³ atoms.
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An atom has a charge of +1 in its nucleus. Which statement must be true for this atom to have no net charge?
There is one neutral neutron in the nucleus as well.
There is one negatively charged electron outside the nucleus.
There is one negatively charged electron in the nucleus.
The one positive proton has no influence on the overall charge of the atom.
The statement that is true regarding the atom that has a charge of +1 in its nucleus for it to have no net charge is that there is one negatively charged electron outside the nucleus (option B).
How is net charge formed?An atom is made up of three subatomic particles namely;
Proton; which is the positively charged particleElectron; which is the negatively charged particleNeutronThe number of protons and electrons in the atom is responsible for the net charge of that atom. For example, if there are more protons than electrons, the atom will be positively charged.
However, according to this question, an atom has a charge of +1 in its nucleus. This means that for this atom to have no net charge i.e. 0, there must also be one electron orbiting outside the nucleus.
Therefore, the statement that is true regarding the atom that has a charge of +1 in its nucleus for it to have no net charge is that there is one negatively charged electron outside the nucleus.
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Which electron occupies a specific energy level?
Answer:
nucleus
Explanation:
It is an electron
I need help with this please
Compounds of bromine that conduct electricity are ionic compounds whereas compounds of bromine that never conduct electricity are covalent in nature.
What are compounds?Compounds are substances which are composed of two or more elements chemically combined together.
Compounds may be covalent in nature or ionic in nature depending on the nature of the type of bonds present in the compounds.
Compounds that are formed by compounds with large electronegativity differences contain ionic bonds, as these elements form ions.
Ionic compounds conduct electricity in either molten or solution form. Examples of ionic compounds are sodium bromide, calcium bromide, etc.
Compounds that are formed by compounds with very small or no electronegativity differences contain covalent bonds, and these elements form molecules.
Covalent compounds do not conduct electricity in either molten or solution form. Examples of covalent compounds are hydrogen bromide, bromine trifluoride, etc.
In conclusion, bromide compounds may be covalent or ionic.
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A 29.1 g sample of solid CO2 (dry ice) is added to a container at a temperature of 100 K with a volume of 3.4 L.
If the container is evacuated (all of the gas removed), sealed, and then allowed to warm to room temperature T = 298 K so that all of the solid CO2 is converted to a gas, what is the pressure inside the container?
Answer:
sugma
Explanation
breaking bad
Hydrofluoric acid (HF) is produced by treatment of the mineral fluorite (CaF2) with concentrated sulfuric
acid (H2SO4) at 265 °C. It is a precursor to almost all fluorine compounds, including Prozac (a
pharmaceutical drug) and Teflon. HF is a colourless solution that is highly corrosive, capable of dissolving
many materials, especially oxides such as glass (HF, Ka = 6.8 x 10-4
)
(a) What is the pH of a 0.380 M aqueous solution of HF?
(b) What is the pH of a 0.040 M aqueous solution of HF?
The pH of a 0.380 M aqueous solution of HF is 1.79
The pH of a 0.040 M aqueous solution of HF is 2.28
What is the pH of a solution?The pH of a solution is the negative logarithm to based 10 of the hydrogen ion concentration of a solution.
The pH of a weak acid solution is related to its Ka by the Henderson-Hasselbalch equation.
The expression for the the Ka of hydrofluoric acid is given below:
Ka = [H⁺] * [F⁻] / [HF]
The Ka of HF = 6.8 x 10⁻⁴
To find the pH of the given solutions of HF; we assume at equilibrium that the change in the concentration is very small.
Let [H⁺] and [F⁻] be x respectively at equilibrium
Therefore, the equation above simplifies to:
Ka = x² / [HF]
x = √Ka * [HF]
(a) The pH of a 0.380 M aqueous solution of HF will be
x = √(6.8 x 10⁻⁴ * 0.38)
x = 0.016
[H⁺] = 0.016
pH = 1.79
(b) The pH of a 0.040 M aqueous solution of HF will be
x = √(6.8 x 10⁻⁴ * 0.040)
x = 0.0052
[H⁺] = 0.0052
pH = 2.28
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An engineer needs to transport a large amount of nitrogen, but has only one truck and no pressure vessels for transporting compressed gas. explain what the engineer could do to the nitrogen to transport it safely.
The gas must be transported in upright position and the engineer must avoid excessively shaking the cylinder.
How do you transport nitrogen gas?We know that a gas must be transported under pressure. This implies that the gas is subjected to a very high magnitude of pressure so that the gas is liquefied. The liquefied gas is at very high pressure and we would need to make use of a pressure device in order to be able to effectively transport the gas. We must not forget that the transport of a gas under pressure is a very risky affair. As the gas is being transported, care must be taken to ensure that excessive pressure is not put on the cylinders as this could lead to an explosion and potential fires if the gas is inflammable.
Nitrogen must be transported under pressure. Sometimes, we can not lay hands on the required pressure vessels for transporting compressed gas. In that case, the gas must be transported in upright position and the engineer must avoid excessively shaking the cylinder.
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