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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.
संबंधित प्रश्न
Describe a simple experiment to illustrate that air exerts pressure.
Give reasons for the following:
Two holes are made in a sealed oil tin to take out oil from it.
What is a barometer?
What is an aneroid barometer? Draw a neat and labelled diagram to explain its construction and working.
What is meant by the term ‘Atmospheric Pressure’?
Give reason:
Air pressure decreases with increasing altitude.
At higher altitudes, air becomes ______
The atmosphere is a layer of gases surrounding the planet.
As we go from the equator of the earth to pole of the earth, the value of acceleration due to gravity ______.
