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प्रश्न
What is the purpose of a barometer? State two major defects of a simple barometer.
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उत्तर
Simple barometer has two main defects:
(i) It is not suitable for making an accurate measurements of atmospheric pressure as any change in the level of mercury in the tube changes the level of the free surface of mercury is a trough and fixed scale cannot be used with it.
(ii) Simple barometer is not portable. So, it cannot be used by airmen, navigators, mountaineers, who need a portable barometer.
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संबंधित प्रश्न
Write the numerical value of the atmospheric pressure on the surface of earth in pascal.
Name the physical quantity which is expressed in the unit 'atm'. State its value in pascal.
Explain the following :
Water does not run out of a dropper unless its rubber bulb is pressed .
What is an aneroid barometer? Draw a neat and labelled diagram to explain its construction and working.
What do the following indicate in a barometer regarding weather : gradual fall in the mercury level
Briefly explain the three chief types of winds.
What effect does temperature have on air pressure?
What is meant by atmospheric pressure?
What is referred to as atmospheric pressure?
The increase in internal energy of 1 kg of water at 100°c when it is converted into steam at the same temperature and at 1 atmospheric pressure will be ______.
(density of steam is 0.6 kg m-3, latent heat of vaporisation of water = 2.25 × 106 J kg-1).
