Hi,

We know that the standard density of air is 1.225 kg/m3 (at sea level, 15 oC, & 1 atm). The density, however, is not constant as it changes daily according to the local atmospheric pressure, temperature, elevation, and humidity maybe.

For a certain day(i), is it safe to apply the ideal gas law, i.e., ρi=PiM/RTi ? Is the elevation and humidity taken into account in this formula? Is there a better widely applicable recipes? 

Your shared thoughts and discussions are highly appreciated,

Abdo,

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