Table of dry air properties at atmospheric pressure from −20 to 300 °C: density, specific heat, dynamic and kinematic viscosity, thermal conductivity and Prandtl number.
| T (°C) | ρ (kg/m³) | cₚ (kJ/(kg·K)) | μ (10⁻⁵ Pa·s) | ν (10⁻⁵ m²/s) | k (W/(m·K)) | Pr |
|---|---|---|---|---|---|---|
| −20 | 1.394 | 1.003 | 1.615 | 1.158 | 0.0225 | 0.721 |
| 0 | 1.292 | 1.004 | 1.716 | 1.328 | 0.0241 | 0.715 |
| 10 | 1.247 | 1.004 | 1.765 | 1.416 | 0.0249 | 0.712 |
| 20 | 1.204 | 1.004 | 1.813 | 1.506 | 0.0257 | 0.709 |
| 25 | 1.184 | 1.005 | 1.837 | 1.552 | 0.0261 | 0.708 |
| 30 | 1.164 | 1.005 | 1.861 | 1.598 | 0.0265 | 0.706 |
| 40 | 1.127 | 1.005 | 1.907 | 1.692 | 0.0272 | 0.704 |
| 50 | 1.092 | 1.006 | 1.953 | 1.788 | 0.028 | 0.702 |
| 60 | 1.06 | 1.007 | 1.999 | 1.886 | 0.0288 | 0.7 |
| 80 | 0.9995 | 1.008 | 2.087 | 2.088 | 0.0302 | 0.696 |
| 100 | 0.946 | 1.01 | 2.173 | 2.297 | 0.0317 | 0.693 |
| 150 | 0.8342 | 1.016 | 2.379 | 2.851 | 0.0352 | 0.687 |
| 200 | 0.746 | 1.024 | 2.571 | 3.447 | 0.0385 | 0.685 |
| 300 | 0.6159 | 1.045 | 2.927 | 4.752 | 0.0446 | 0.685 |
Ideal gas (ρ = P/RT, R = 287.05 J/(kg·K); at 1 atm it differs from the real gas by less than 0.1 %). μ and k from Sutherland's law (μ₀ = 1.716 × 10⁻⁵ Pa·s, S = 110.4 K; k₀ = 0.0241 W/(m·K), S = 194 K, referred to 0 °C); typical error of a few percent. ν = μ/ρ, Pr = cₚμ/k.
Source: CoolProp (MIT license): reference equation of state of water (IAPWS-95) and ideal-gas cₚ of air, the same as the «Thermodynamic tables» tab. ↗ · Sutherland's law (equation): Sutherland, W. «The viscosity of gases and molecular force», Phil. Mag. 36 (1893) 507–531.
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