Topic: Thermodynamics
The difference between two specific heats, $C_p - C_v = \frac{R}{J}$. This relation is valid for
- A. Any gas
- B. Perfect gases
- C. Real gases
- D. Pure gases
Answer: B. Perfect gases
Explanation: Mayer's relation $C_p - C_v = R$ (or $R/J$ in appropriate units) strictly applies to ideal or perfect gases. For perfect gases, specific heats ($C_p$ and $C_v$) are assumed not to change with temperature.