海拔大气压力计算器
使用此海拔大气压力计算器快速获得准确的计算结果。
Pressure at Altitude
56,266.42 Pa
Pressure at Altitude vs Surface Pressure (P0)
公式
## Barometric Pressure at Altitude For an isothermal atmosphere the pressure decreases exponentially with height. ### Formula **P(h) = P0 * exp(-h / H)** - *P0* = surface pressure - *h* = altitude above the surface - *H* = scale height (about 8.5 km for Earth) Every scale height of ascent reduces the pressure by a factor of e (about 2.718).
计算示例
Earth at 5 000 m altitude (P0 = 101 325 Pa, H = 8 500 m).
- 01P = P0 * exp(-h/H)
- 02P = 101325 * exp(-5000/8500)
- 03exp(-0.5882) = 0.5556
- 04P = 101325 * 0.5556 = 56 300 Pa = 0.556 atm
常见问题
Does this work for Mars?
Yes, but with Martian values: P0 is approximately 636 Pa and H is approximately 11 100 m.
Why is the atmosphere assumed isothermal?
The exponential formula is exact for constant temperature. For real atmospheres with lapse rates, it is a good first approximation over limited altitude ranges.
At what altitude is pressure half of sea level?
Solving exp(-h/H) = 0.5 gives h = H * ln(2), approximately 5 900 m on Earth.