If we mechanically squeeze a gas into a smaller volume, what happens to the pressure and temperature? (a) the pressure and temperature both increase, but we can't predict how much each one will change. (b) the pressure increases and the temperature decreases (c) only the pressure increases

If we mechanically squeeze a gas into smaller volume, the pressure and temperature both will increase, but we can't predict how much each one will change.

B

Explanation:

According to kinetic theory of gases, the pressure of a gas is inversely proportional to the volume of the gas. So as the volume is decreased, the pressure of the gas tends to increase.

As there is an increase in the pressure due to compression of volume by an external force, the temperature of the gas also increases as the external force or the work done will transfer its energy to the gas molecules leading to the increase in temperature.

The best example for this is heating of the mechanical air pumping machine for cycle Tyre.

During filling of air in cycle Tyre, we have to give extra mechanical energy in the pumping piston to compress the volume of air in the pumping machine and that gas get transferred to the Tyre.

But while pumping, the mechanical pumping machine gets heated up due to the mechanical work done on the piston.

This work done is transferred as heat to the molecules of gas thus increasing the gas temperature on decreasing the volume and also the pressure will be increased when volume is compressed mechanically.

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