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प्रश्न
How will you show that there is vacuum above the surface of mercury in a barometer? What name is given to this vacuum?
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उत्तर
The space above mercury is a vacuum. This empty space is called 'Torricellian vacuum'.
This can be shown by tilting the tube till the mercury fills the tube completely. Again when the mercury column becomes stationary, the empty space is created above the mercury column. If somehow air enters into the empty space or a drop of water gets into the tube, it will immediately vaporize and the air will exert pressure on mercury column due to which the barometric height will decrease.
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संबंधित प्रश्न
State two experiences that made you think that air exerts pressure.
What do you mean by atmospheric pressure?
Write the numerical value of the atmospheric pressure on the surface of earth in pascal.
Explain the following :
Two holes are made in a completely filled sealed tin can to take out oil from it .
Distinguish between the following:
Isobars and Isotherms
Describe an experiment to demonstrate that air exerts pressure.
Give reason:
Air pressure decreases with increasing altitude.
At higher altitudes, air becomes ______
Define one atmosphere.
