Question

In a lab some students are trying to perform an adiabatic expansion for the gas. For this:
1. Give heat to the gas
2. Extract heat from the gas
3. No heat should be given or taken out from the gas
4. None of these

Answer 1

Correct Answer - Option 3 : No heat should be given or taken out from the gas

CONCEPT:

Adiabatic process:

• When a thermodynamic system undergoes a change in such a way that no exchange of heat takes place between the System and surroundings, the process is known as the adiabatic process.

Essential conditions for the adiabatic process:

1. There should not be any exchange of heat between the system and its surroundings. All walls of the container and the piston must be perfectly insulating.
2. The system should be compressed or allowed to expand suddenly so that there is no time for the exchange of heat between the system and its surroundings.

The relation between the volume and temperature in an adiabatic process is given as,

⇒ TVγ-1 = constant

Where P = pressure, T = temperature, and γ = adiabatic index

EXPLANATION:

• From the above, it is clear that the system should be compressed or allowed to expand suddenly so that there is no time for the exchange of heat between the system and its surroundings. Hence, no heat should be given or taken out from the gas. Therefore, option 3 is correct.