International Standard Atmosphere (ISA) table from 0 to 20,000 m: temperature, pressure, air density and speed of sound by altitude.
| Altitude (m) | T (°C) | P (kPa) | ρ (kg/m³) | Speed of sound (m/s) |
|---|---|---|---|---|
| 0 | 15 | 101.3 | 1.225 | 340.3 |
| 500 | 11.75 | 95.46 | 1.167 | 338.4 |
| 1000 | 8.5 | 89.87 | 1.112 | 336.4 |
| 1500 | 5.25 | 84.56 | 1.058 | 334.5 |
| 2000 | 2 | 79.5 | 1.006 | 332.5 |
| 2500 | −1.25 | 74.68 | 0.9569 | 330.6 |
| 3000 | −4.5 | 70.11 | 0.9091 | 328.6 |
| 4000 | −11 | 61.64 | 0.8191 | 324.6 |
| 5000 | −17.5 | 54.02 | 0.7361 | 320.5 |
| 6000 | −24 | 47.18 | 0.6597 | 316.4 |
| 8000 | −37 | 35.6 | 0.5252 | 308.1 |
| 10000 | −50 | 26.44 | 0.4127 | 299.5 |
| 11000 | −56.5 | 22.63 | 0.3639 | 295.1 |
| 15000 | −56.5 | 12.04 | 0.1937 | 295.1 |
| 20000 | −56.5 | 5.475 | 0.08803 | 295.1 |
Geopotential altitude. Troposphere (up to 11 km): T = 15 °C − 6.5 °C/km; from 11 to 20 km, T = −56.5 °C constant. g = 9.80665 m/s², R = 287.053 J/(kg·K), γ = 1.4.
Source: Equations of the International Standard Atmosphere (ISO 2533:1975), equal to the U.S. Standard Atmosphere 1976 up to 32 km; computed by Simuveliq.
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