Calculate the Density of Air at Different Pressures and Temperatures Using the Ideal Gas Law

The ideal gas law can be used to find the density of air a different pressures and temperatures. The density of air is calculated using the ideal gas equation together with the ideal gas constant. The ability to calculate the density of air is important because the density of air (and other gases) varies greatly at different pressures and temperatures, yet values of the density of air are needed for a many engineering and scientific calculations, including pitot tube air velocity measurements and air resistance/drag force calculations. For many practical values of temperature and pressure air behaves like an ideal gas, so the density of air at different pressures and temperatures can be calculated using the ideal gas law.