Adiabatic Tv
输入初态温度/体积、末态体积与比热比 γ,求末态温度。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Adiabatic relation | T V^(γ−1) = const | Reversible adiabatic |
| Heat capacity ratio | γ = c_p/c_v, air ≈1.4 | Thermodynamics |
| Reversible only | Valid for isentropic only | Thermodynamic process |
| PV form | pV^γ = const equivalent | Ideal gas relations |
| Engineering use | Compressor/turbine temperature | Thermal engineering |
| Real deviation | Real exponent below γ | Engineering correction |
Constants used on this page and their authoritative sources, for verification and citation
| Constant | Value | Unit | Source |
|---|---|---|---|
| Heat capacity ratio γ, monatomic ideal gas | 5/3 = 1.667 | — | Theoretical value from equipartition (e.g. He, Ar) |
| Heat capacity ratio γ, diatomic ideal gas | 7/5 = 1.400 | — | Theoretical value from equipartition (N₂, O₂ at room temperature) |
| Heat capacity ratio of dry air (engineering) | 1.400 | — | Common engineering approximation (dry air, 0–100 ℃) |
| Molar gas constant R | 8.314462618 | J·mol⁻¹·K⁻¹ | New SI (derived from exact N_A·k) |
Note: γ decreases with temperature as vibrational modes are excited at high temperature; use measured heat capacities for precision work. This page defaults to γ = 1.4.
工作与生活中的相关计算与查询。