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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.
संबंधित प्रश्न
The atmospheric pressure at sea level is nearly
How is the barometric height of a simple barometer affected if A drop of liquid is inserted inside the tube?
At sea level, the atmospheric pressure is 76 cm of Hg. If air pressure falls by 10 mm of Hg per 120m of ascent, what is the height of a hill where the barometer reads 70 cm Hg. State the assumption made by you.
Give reasons for the following:
As we go higher, the atmospheric pressure decreases.
State briefly, how and why the atmospheric pressure of a place varies with the altitude. Draw an approximate graph to illustrate this variation.
What is meant by atmospheric pressure?
What does a falling barometer indicate?
What will be the effect on air pressure if the temperature drops? Why?
Air pressure is expressed in ______.
The highest air pressure at sea level was recorded at ______ Russia.
