Question

A: The number of properties required to fix the state of a system is given by the “state postulate”.
R: The state of a simple compressible system is completely specified by two independent, intensive properties. About the statements A and R applied to a single-phase system,

• A. A is correct and R is incorrect.
• B. A is incorrect and R is correct.
• C. Both A and R are incorrect.
• D. Both A and R are correct.

Hint:

Remember: For a simple compressible system in a single phase, two independent intensive properties (like $P$ and $T$, or $P$ and $v$) completely define the state.

Answer 1

The Correct Option is D

Step 1: Understanding the State Postulate.
The state postulate states that the state of a simple compressible system is completely specified by giving the values of two independent intensive properties.
Step 2: Evaluating Statement A.
Statement A correctly defines the state postulate. Therefore, A is correct.
Step 3: Evaluating Statement R.
For a single-phase simple compressible system (e.g., liquid water, vapor, gas), specifying any two independent intensive properties (e.g., pressure and temperature, or pressure and specific volume) fixes the state. Hence, R is also correct. Thus, both A and R are correct. Final Answer: \[ \boxed{\text{Both A and R are correct (Option D)}} \]