# Density of air as a function of pressure and temperature

This online calculator calculates the air density value for a given pressure and temperature using the Mendeleev-Clapeyron equation for an ideal gas.

,

where

ρ is the density of air,

P is the absolute pressure (the default is 101.325 kPa - atmospheric pressure),

M is the molar mass, 28.98 g/mol for dry air,

R is the universal gas constant, 8.314,462,618,153,24 J/(mol∙K),

T is the temperature in Kelvin (°C + 273.15).

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