Advertisements
Advertisements
प्रश्न
What is the purpose of a barometer? State two major defects of a simple barometer.
उत्तर
Simple barometer has two main defects:
(i) It is not suitable for making an accurate measurements of atmospheric pressure as any change in the level of mercury in the tube changes the level of the free surface of mercury is a trough and fixed scale cannot be used with it.
(ii) Simple barometer is not portable. So, it cannot be used by airmen, navigators, mountaineers, who need a portable barometer.
APPEARS IN
संबंधित प्रश्न
Give reason for the following:
A balloon collapses when air is removed from it.
How is water drawn up from a well by a water pump?
Illustrate with the help of a labelled diagram of a simple barometer that the atmospheric pressure at a place is 76 cm of Hg.
At a given place, a mercury barometer records a pressure of 0.70 m of Hg. What would be the height of water column if mercury in barometer is replaced by water? Take density of mercury to be = 13.6 × 103 kg m-3.
Draw a simple diagram of a Fortin's barometer and state how it is used to measure the atmospheric pressure.
Give reason:
Air pressure decreases with increasing altitude.
The atmosphere is a layer of gases surrounding the planet.
Give reasons:
Why artificial pressure creates in Aircraft?
The air pressure at sea level is referred to as ______.
The increase in internal energy of 1 kg of water at 100°c when it is converted into steam at the same temperature and at 1 atmospheric pressure will be ______.
(density of steam is 0.6 kg m-3, latent heat of vaporisation of water = 2.25 × 106 J kg-1).
