Answer the following questions.
1. What is the composition of air?
2. Why do we need air to hear sounds?
3. How does air help to keep the earth cool?
4. Why is air important for us?
5. What is air pressure?
Answers
Answer:
Ans-1 The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
Ans-2 Sound can't be carried in the empty vacuum of space because sound waves need a medium to vibrate through such as air or water. ... However, because the particles are so spread out, the sounds waves they produce are at such a low frequency, humans are incapable of hearing them.
Ans-3 Sound can't be carried in the empty vacuum of space because sound waves need a medium to vibrate through such as air or water. ... However, because the particles are so spread out, the sounds waves they produce are at such a low frequency, humans are incapable of hearing them.
Ans-4 Air is important because we can't live without air.
Ans-5 Atmospheric pressure, also known as barometric pressure, is the pressure within the atmosphere of Earth. The standard atmosphere is a unit of pressure defined as 101,325 Pa, which is equivalent to 760 mm Hg, 29.9212 inches Hg, or 14.696 psi.
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