Question

Certain quantities cannot be located on the graph by a point but are given by the area under the curve corresponding to the process. These quantities in concepts of thermodynamics are called as
1. cyclic functions
2. point functions
3. path functions
4. real functions

Answer 1

Correct Answer - Option 3 : path functions

Concept:

• Path functions: These depend on the path followed by the system. For e.g. Work and heat. The cyclic integral of path function is not zero.
• Point function: These do not depend on the path followed. These only depend on the end states of the system. The cyclic integral of a point function is zero. For e.g Temperature, Pressure, etc.

Explanation:

• Path functions like heat transfer and work done cannot be represented by points in the graph but they can be represented by area under the curve.
• Heat Transfer will be the area under the curve in T-S diagram whereas work transfer will be the area under the curve in the P-V diagram.