Chapter 24, Problem 8A

To determine

Effect on internal energy of the systemwhen work is done adiabatically on the system and when the work is done by the system.

Explanation of Solution

Introduction:

As per first law of thermodynamics, once heat is given to the system, some of the energy goes into changing the internal energy and some in the work done.

Heat added to a system = Work done+ increase in internal energy

In an adiabatic process, there is no heat exchange for a system. So, when work is done on the system, the internal energy of the system increases and when the work is done by the system, the internal energy decreases.

Conclusion:

The internal increases when work is done on the system and decreases when work is done by the system.