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प्रश्न
Mention two demerits of a simple barometer and state how they are removed in a Fortin barometer .
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उत्तर
In a simple barometer, there is no protection for the glass tube but in Fortin's barometer, this defect has been removed by enclosing the glass tube in a brass case.
In a simple barometer, a scale cannot be fixed with the tube (or it cannot be marked on the tube) to measure the atmospheric pressure but Fortin's barometer is provided with a vernier calipers to measure the accurate reading.
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संबंधित प्रश्न
State two experiences that made you think that air exerts pressure.
Explain why holes are made in hanging banners and hoardings.
The atmospheric pressure is nearly 105 Pa.
What do you understand by atmospheric pressure?
We do not feel uneasy even under enormous pressure of the atmosphere above as well as around us. Give a reason.
How is the barometric height of a simple barometer affected if Its tube is slightly tilted from vertical?
State two advantages of an aneroid barometer over a simple barometer.
Why do not we feel uneasy even under enormous pressure of the atmosphere above as?
One atmosphere is equivalent to 1,00,000 newton force acting on one square metre.
