Which of the following is NOT a point function?

Explanation:

Point function:

• The thermodynamic properties which depend on the end state only (independent of the path followed) are known as point function like temperature, pressure, density, volume, enthalpy, entropy etc.

Path function: 

• The thermodynamic properties which depend on the end states, as well as the path followed, are known as path function like heat and work.

Additional Information

Thermodynamic property: 

• A thermodynamic property is any property that is measurable, and whose value describes a state of a system.
• Some e.g of the thermodynamic property are pressure, temperature, viscosity, density. 
• Properties are point function i.e. these do not depend on the path followed. ​

Intensive Property: 

• These are the properties of the system which are independent of mass under consideration. For e.g. Pressure, Temperature, density, etc.

Extensive Properties:

• The properties depend on the mass of the system under consideration. For e.g Internal Energy, Enthalpy, Volume, Entropy, etc.