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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
Fill the missing word in the blank spaces in the following statements:
Air moves from a region of __________ pressure to a region of ________ pressure.
The atmospheric pressure is nearly 105 Pa.
What do you mean by atmospheric pressure?
What is an aneroid barometer? Draw a neat and labelled diagram to explain its construction and working.
What is an altimeter? State its principle. How is its scale calibrated?
At sea level, the atmospheric pressure is 1.04 x 105 Pa. Assuming g = 10 m s-2 and density of air to be uniform and equal to 1.3 kg m-3, find the height of the atmosphere.
Give reasons for the following:
Temperature and pressure are inversely related to one another.
Give reason:
Air pressure decreases with increasing altitude.
Air pressure is expressed in ______.
High pressure is called ______.
