The instrument that contains a liquid of low density, such as alcohol, is called a hydrometer. It is commonly used to measure the specific gravity or density of liquids like gasoline, milk, and even urine. It's an easy tool to use, and it's relatively accurate.
A hydrometer consists of a glass or plastic tube with a bulb on one end and a stem on the other. It has a calibrated scale printed on it to read the specific gravity of the liquid. As you insert the hydrometer into the liquid, it displaces the liquid and sinks deeper into the liquid until it reaches a point where it's balanced. The point at which the hydrometer balances determines the specific gravity of the liquid. Specific gravity is the density of a liquid compared to the density of water.
The specific gravity of water is one, so anything with a specific gravity less than one will float, and anything with a specific gravity more than one will sink. In conclusion, a hydrometer is an essential tool used to measure the specific gravity of liquids.
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Directly above Earth's north pole, on
the celestial sphere, is
• A. The Big Dipper
• B. Ursa Major, the great bear
• C. The brightest star in the sky
• D. The North Celestial Pole
• E. C and D
The correct answer is option (d) which is directly above Earth's north pole on the celestial sphere is the North Celestial Pole.
What is the North Celestial Pole?The two places in the sky where the axis of rotation of the Earth intersects the celestial sphere are known as the north and south celestial poles.
Observers at Earth's North Pole and South Pole, respectively, see the north and south celestial poles as being straight overhead all the time.
1. The celestial sphere is an imaginary sphere surrounding Earth, onto which we project the positions of stars and celestial objects.
2. The North Pole of the Earth is the point around which the Earth rotates. If we extend the Earth's axis of rotation into space, it points towards the North Celestial Pole.
3. The North Celestial Pole is the point on the celestial sphere directly above Earth's North Pole.
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