# Atmospheric air pressure

The hypsometric equation is taken from the keisan online calculator .

The standard barometric height equation is valid for standard atmosphere with static pressure of 1013.25 hPa, air temperature of 15°C and a temperature gradient of 0.65 K per 100 m. The euqation is taken from Wikipedia .

Symbol
$p_{atm}$
Unit
hPa
Formulae
 $1013.25 \left(- \frac{0.0065 h_{atm}}{0.0065 h_{atm} + \theta_{at} + 273.15} + 1\right)^{5.257}$ hypsometric equation for typical static pressure $1013.25 \left(1 - 2.25576956446295 \cdot 10^{-5} h_{atm}\right)^{5.255}$ standard barometric height equation for standard atmosphere (15°C)
Related
$h_{atm}$
$\theta_{at}$