Question

1. Explain why it is fine to say delta U, but not Delta w?

2. If a perfect gas undergoes an adiabatic compression, do you expect the final temperature to be lower, higher or the same as the initial temperature?

Answer 1

Answer 1) we can not say delta w, because delta w means small work done by the system,but work is measured in terms of total work done by the system and not small work done by system.hens we can say delta U ( change in internal energy) but not delta w.

2) If a perfect gas undergoes an adiabatic compression ,final temperature is higher than the initial temperature.

Due to increase in pressure in adiabatic compression volume decrease,and temperature increases.