![]() This equation gives the relationship among the pressure, P, volume, V, and temperature, T, of n moles of an ideal gas, using an ideal gas constant, R. ![]() You may be familiar with the ideal gas law in the following commonly used form: PV = nRT. ![]() Although this article is primarily about determining the density of air, the density of other gases at known temperature and gas pressure can also be estimated using the ideal gas law in the same way. The ideal gas equation and the ideal gas constant, which express the ideal gas law provide a means for calculating air density for different pressures and temperatures. The density of air varies significantly with both pressure and temperature, so how do you find the density of air at different pressures and temperatures as needed for applications such as drag force calculations, frictional loss for flow in pipes or ducts, or air velocity determination with a pitot tube. ![]()
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