Question

A sample of gas has been found to be expanding from volume ${{V}_{1}}$ to ${{V}_{2}}$ ​. The amount of work done by the gas will be the greatest when the expansion has,
A. isothermal
B. isobaric
C. adiabatic
D. similar in all case

Answer 1

Hint: An isobaric process will be defined as the process in thermodynamics in which the pressure will remain fixed. An adiabatic process can be defined as a type of thermodynamic process which will be happening without the transfer of heat or mass between the system and its surroundings. An isothermal process can be defined as the type of process in thermodynamics in which the temperature of the system remains fixed. This will help you in answering this question.

Complete answer:
An isobaric process will be defined as the thermodynamic process in which the pressure will remain fixed. This will be generally reached by permitting the volume in order to expand or contract to neutralize any pressure variation that would be caused by the heat transfer. An isothermal process can be defined as the type of process in thermodynamics in which the temperature of the system remains fixed. An adiabatic process can be defined as a type of thermodynamic process which will be happening without the transfer of heat or mass between the system and its surroundings. An adiabatic process unlike an isothermal process will transfer the energy to the surroundings only as work. At the fixed pressure, the PV curve will be enclosing the maximum area. Hence the work will be maximum in such a case compared to any other processes.

Therefore the correct answer has been obtained as option B.

Note:
It will be a process where there will be a gas compression and heat is produced. One of the simplest examples will be the release of the air from a pneumatic tire. Adiabatic Efficiency will be applied to the devices like the compressors, and turbines.