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.
The air pressure at the sea level is found to be : | |||
Right Option : C | |||
View Explanation |
As we go higher up on mountains our ears pop because | |||
Right Option : C | |||
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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I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
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Abhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
One of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Abhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Abhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
My experience with Abhyas academy is very nice or it can be said wonderful. I have been studying here from seven class. I have been completing my journey of three years. I am tinking that I should join Abhyas Academy in tenth class as I am seeing much improvement in Maths and English
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Third consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...
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When I have not joined Abhyas Academy, my skills of solving maths problems were not clear. But, after joining it, my skills have been developed and my concepts of science and SST are very well. I also came to know about other subjects such as vedic maths and reasoning.
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My experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.