Pressure in Air
Pressure in Air
PRESSURE IN AIR: Our Earth’s surface is covered with a thick layer of air called the atmosphere. It extends up to a height of 200 km. The air is thick near the surface of Earth. It becomes thinner and thinner as we go higher up. Sufficient air for breathing is present only up to about 15 km above the Earth.
This lowermost layer is called the troposphere. In this layer clouds are formed. Jet airplanes fly at about 20 km above the Earth in a layer of air called the stratosphere. This layer extends from 15 km to 50 km above the Earth. Like all gases, air also has weight and hence it exerts pressure. The air in an average living room weights over a 100 kg.
Just as water pressure is caused by the weight of water, the weight of all the air above the Earth exerts the atmospheric pressure. The force exerted by the atmosphere on unit area is called atmospheric pressure. What happens when, you fill the air in a balloon? The balloon inflates due to the pressure of the air inside it. If you fill too much air in the balloon what will happen? The balloon will burst because the pressure on the walls of the balloon will increase beyond which its walls can withstand. Air exerts pressure in both upwards and downwards direction.
NOTE: The water of dead sea contains much more salt than the water in other seas. This denser water exerts a lot of buoyant force which makes it easy to float in dead sea.
As we go higher up on mountains our ears pop because | |||
| Right Option : C | |||
| View Explanation |
Which of the following are correct : (a) Our Earth’s surface is covered with a thick layer of air called the atmosphere. (b) The atmosphere extends up to a height of 200 km. (c) The layer of air becomes thinner and thinner as we go higher up. | |||
| Right Option : D | |||
| View Explanation | |||
Objects in a liquid are buoyed _____________________ because the pressure acting up against the bottom of the object exceeds the pressure acting down against the top. | |||
| Right Option : A | |||
| View Explanation | |||
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