Question

Which of the following are TRUE for pressure, temperature and density of a thermodynamic system?

• A. path functions
• B. point functions
• C. inexact differentials
• D. exact differentials

Hint:

In thermodynamics, point functions have exact differentials, while path functions have inexact differentials.

Answer 1

The Correct Option is B, D

Step 1: Understand the properties of thermodynamic functions.
In thermodynamics, properties like pressure, temperature, and density are state functions, meaning they depend only on the state of the system and not on the path taken to reach that state.
Step 2: Evaluate the options.
- Option (A): Path functions are dependent on the process or path taken to reach a state, but pressure, temperature, and density are state functions.
- Option (B): This is correct because pressure, temperature, and density are point functions that depend only on the state of the system.
- Option (C): Inexact differentials apply to path-dependent quantities, not to state functions like pressure, temperature, and density.
- Option (D): This is correct because point functions like pressure, temperature, and density have exact differentials. Thus, the correct answers are (B) and (D).