Advertisements
Advertisements
Question
How will you show that there is vacuum above the surface of mercury in a barometer? What name is given to this vacuum?
Advertisements
Solution
The space above mercury is a vacuum. This empty space is called 'Torricellian vacuum'.
This can be shown by tilting the tube till the mercury fills the tube completely. Again when the mercury column becomes stationary, the empty space is created above the mercury column. If somehow air enters into the empty space or a drop of water gets into the tube, it will immediately vaporize and the air will exert pressure on mercury column due to which the barometric height will decrease.
RELATED QUESTIONS
Give reasons for the following:
As we go higher, the atmospheric pressure decreases.
Name the instrument used to measure atmospheric pressure.
How is the reading of a barometer affected when it is taken to: A hill
A solid weighs 2.10 N in air. It has a relative density of 8.4. How much will the body weigh if placed: In water
If there is low pressure at the equator, what will be the condition of air pressure in the Arctic Zone?
What effect does temperature have on air pressure?
One atmosphere is equivalent to 1,00,000 newton force acting on one square metre.
Why is it not advisable to use a fountain pen while travelling in an aeroplane?
Clouds float in atmosphere because of their low ______.
