Distinguish between an isothermal and adiabatic change.

Question 04: Distinguish between an isothermal and adiabatic change.

Answer:

Isothermal Change	Adiabatic Change
1. A process in which the temperature of the working substance remains constant is called as isothermal process.	1. A process in which the working substance neither receives, nor gives out heat is called as adiabatic process.
2. During operation, the temperature of the working substance remains constant.	2. In this process the amount of heat in the working substance remain constant.
3. Heat exchange is allowed	3. Heat exchange is not allowed
4. It is a slow process	4. It is a quick process
5. There is no change in internal energy.	5. Change in internal energy is equal to the work done.
6. PV = Constant	6. PV^ˠ = Constant
7. Container should be good	7. Vessel is perfect nonconductor of heat.
8. Heat energy equation becomes dQ = 0 + $\frac{dW}{J}$	8. Heat energy equation becomes 0 = dU + $\frac{dW}{J}$

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