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प्रश्न
What is an aneroid barometer?
Draw a neat and labeled diagram to explain its construction and working.
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उत्तर
Aneroid barometer is a portable type of barometer.
In this, no liquid is used. It consists of a metal box corrugated to make it flexible. The lower side of the box is fixed to the base of the instrument and the upper side is supported by a stout spring S. The box is partially evacuated. So it tends to collapse under the pressure of air. The stout spring balances the thrust on the metal box due to normal air pressure and prevents the box from collapsing.
When atmospheric pressure changes, the surface supported by the spring S moves in if pressure increases or out if the pressure decreases slightly. This small movement is increased considerably by a system of levers one end of which is connected to the spring S. The other end of the lever system is connected to a chain which is wrapped round a spindle carrying a pointer. The pointer moves over a scale which is graduated to read the pressure in centimeters or inches.
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संबंधित प्रश्न
What do you mean by atmospheric pressure?
Explain the following :
Water does not run out of a dropper unless its rubber bulb is pressed .
A partially inflated balloon is placed inside a bell jar connected to a vacuum pump. On creating vacuum inside the bell jar, balloon gets more inflated. How does the pressure change: increase, decrease or remains same, inside the (a) bell jar, (b) balloon?
Explain how is the height of mercury column in tube of a simple barometer, a measure of the atmospheric pressure.
How is the barometric height of a simple barometer affected if A drop of liquid is inserted inside the tube?
What is an altimeter? State its principle. How is its scale calibrated?
The unit torr is related to the barometric height as :
State two advantages of an aneroid barometer.
How is the reading of a barometer affected when it is taken to: A hill
Describe an experiment to demonstrate that air exerts pressure.
