Question

Which of the following is not a thermodynamic coordinate?

• A. Gas constant (R)
• B. Pressure (p)
• C. Volume (V)
• D. Temperature (T)

Hint:

Coordinates change; Constants don't.

Answer 1

The Correct Option is A

Step 1: Definition
Thermodynamic coordinates are macroscopic variables that describe the state of a system, such as $P$, $V$, and $T$.
Step 2: Identification
Pressure ($p$), Volume ($V$), and Temperature ($T$) change as the state of the gas changes.
Step 3: Conclusion
The Universal Gas Constant ($R$) is a fixed constant ($8.314 \text{ J mol}^{-1} \text{ K}^{-1}$) and does not describe the specific state of a system.
Final Answer: (a)