Advertisements
Advertisements
प्रश्न
State two experiences that made you think that air exerts pressure.
Advertisements
उत्तर १
We have experienced that when we blow a balloon, the balloon becomes tight. If we try to fill more air, then the balloon will burst after an extent. This happens because air exerts pressure.
We have also experienced the movement of fringes of windows and doors of our houses when wind blows in a high speed. This also happens because air exerts pressure.
उत्तर २
1) Balloons and balls can be used only when they are inflated with air. When balloon is overfilled with air it bursts due to excessive air pressure.
2) Compressed air is used in the brake system for stopping trains.
संबंधित प्रश्न
What do you understand by atmospheric pressure?
Explain the following :
A balloon collapses when air is removed from it.
What is meant by the statement 'the atmospheric pressure at a place is 76 cm of Hg'? State its value in Pa.
Give two reasons why water is not a suitable barometric liquid.
How does the atmospheric pressure change with altitude? Draw an approximate graph to show this variation.
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.
At higher altitudes, air becomes ______
The value of the atmospheric pressure at sea level is
What is meant by atmospheric pressure?
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).
