Atmospheric Pressure
Atmospheric Pressure
Atmospheric pressure is defined as the pressure exerted on an object by the weight of the air above it. The atmospheric pressure on the Earths surface at sea level is about one hundred thousand pascal, i.e., 100 kPa.
| Measuring atmospheric pressure: An instrument called barometer is used to measure atmospheric pressure. It consists of long and thin tube filled with mercury and closed at one end. The open end of the tube is placed in a small trough full of mercury. The pressure exerted by air on the mercury of trough is able to hold certain height of the mercury column. When the air pressure is low, the mercury will move down, and when the air pressure increases the height of the mercury column increases. We can measure the pressure by the weight of mercury column in mm of Hg. Note: At sea level, the atmospheric pressure is 760 mm of Hg and is taken to be equal to 1 atmospheric pressure, i.e., 760 mm of Hg = atmospheric pressure at sea level. |  |
Variation of Atmospheric Pressure:
Aim: To show the presence of atmospheric pressure. Materials needed: A glass tumbler (with a smooth edge at the mouth, and withour a rim), a piece of stiff cardboard ( a little bigger than the mouth of the tumbler), and water. (It would be convenient to perform this activity over a wash basin or the kitchen sink.) Method: Observation: You will observe that the cardboard piece will not fall. Conclusion: Atmospheric pressure provides enough force to support a full glass of water. |  |
The pressure exerted by a liquid: | |||
| Right Option : A | |||
| View Explanation |
Which of the following parameters decreases as we go up ? | |||
| Right Option : C | |||
| View Explanation | |||
Take a glass full of water put a piece of thick card on it. Now turn the glass upside down as shown .What will happen ? | |||
| Right Option : A | |||
| View Explanation | |||
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Cheshta
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Barkha Arora
10thAbhyas 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...
Aman Kumar Shrivastava
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7thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
Aman Kumar Shrivastava
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Manish Kumar
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