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प्रश्न
Draw a simple labelled diagram of a Fortin barometer and state how it is used to measure the atmospheric pressure.
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उत्तर
To measure the atmospheric pressure, first the leather cup is raised up or lowered down with the help of the screw S so that the ivory pointer I just touches the mercury level in the glass vessel. The position of the mercury level in the barometer tube is noted with the help of main scale and the vernier scale. The sum of the vernier scale reading to the main scale reading gives the barometric height.
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संबंधित प्रश्न
Fill the missing word in the blank spaces in the following statements:
Air moves from a region of __________ pressure to a region of ________ pressure.
Mention two demerits of a simple barometer and state how they are removed in a Fortin barometer .
The normal atmospheric pressure is :
Select the correct option.
The atmospheric pressure on the earth’s surface is approximately
State briefly, how and why the atmospheric pressure of a place varies with the altitude. Draw an approximate graph to illustrate this variation.
What will be the effect on air pressure if the temperature drops? Why?
What effect does temperature have on air pressure?
What is meant by atmospheric pressure?
Tyre pressure of 30psi is almost ______ the 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).
