条件 | 気体変化 | W | Q | ΔU | ΔT |
真空への膨張 | 等温膨張 | 0 | 0 | 0 | 0 |
真空への膨張 | 断熱膨張 | 0 | 0 | 0 | 0 |
定圧変化 | 断熱膨張 | \[ -P\Delta V \] | \[ P\Delta V \] | 0 | 0 |
定圧変化 | 断熱膨張 | \[ -P\Delta V \] | 0 | \[ -P\Delta V \] | \[ \frac{-P\Delta V}{CV} \] |
準静的変化 | 等温膨張 | \[ -nRT \ln \frac{V_{2}}{V_{1}}\] | \[ nRT \ln \frac{V_{2}}{V_{1}}\] | 0 | 0 |
準静的変化 | 断熱膨張 | \[ CV\Delta T \] | 0 | \[ CV \Delta T \] | \[ T\left(\left(\frac{V_1}{V_2}\right)^\frac1C-1\right) \] |