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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
Write the numerical value of the atmospheric pressure on the earth surface in pascal.
Give reason for the following:
A balloon collapses when air is removed from it.
How does the atmospheric pressure change with altitude?
Name the physical quantity which is expressed in the unit 'atm'. State its value in pascal.
Give reasons for the following:
The Westerlies in the Southern Hemisphere blow with greater force than those in the Northern Hemisphere.
What is meant by the term ‘Atmospheric Pressure’?
Why do not we feel uneasy even under enormous pressure of the atmosphere above as?
The value of the atmospheric pressure at sea level is
Clouds float in atmosphere because of their low ______.
