Mass=Volume x Density – Calculating the mass of air is relatively simple because, due to its chemical composition, air has an established molar mass at different conditions of volume and pressure. At standard pressure and temperature (STP), for instance, air has a molar volume of 22.4 liters (cubic decimeters) and a molar mass of 29 grams. That is, if you took 29 grams of air at STP, it would spread across 22.4 liters. This relationship can easily be used to determine the mass of any volume of air at a certain pressure.
Things You’ll Need
Measuring tape, Pressure gauge, Calculator or scratch paper