How to calculate gas mixture density

Written by timothy banas
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How to calculate gas mixture density
The density of gas mixtures is somewhat dependent on the volume of their containers. (Propane Tank image by John Walsh from

When you create a mixture of gases, it can be useful to calculate the density of that mixture. To accurately calculate the density of a gas mixture, you simply need to know the densities of the individual gases and the volumes of each gas that you put into the mixture. It should be noted that gas densities are best looked up in references, because weighing gases on a standard scale does not work due to the buoyant force that air exerts on a gas, skewing the measurements. Just think about trying to use a scale to measure the mass of the gas in helium balloon.

Skill level:
Moderately Easy

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  1. 1

    Determine the densities of the gases that you will be using to create the gas mixture. You can find a table that contains the densities of many gases through the link in the References section below. As an example, imagine that you are making a mixture of benzene at 3.486 kilograms per cubic meter (kg/m^3) and butylene at 2.5kg/m^3.

  2. 2

    Consider the volume of each gas that you added to the mixture. Imagine that you created the mixture by adding 0.25m^3 of each gas to a 0.5m^3 container.

  3. 3

    Calculate the mass of each gas that you added by multiplying the volumes by their densities.

    Mass of benzene = density of benzene x volume of benzene = 3.486 x 00.25 = 0.87kg

    Mass of butylene = density of butylene x volume of butylene = 2.5 x 0.25 = 0.625kg

  4. 4

    Add the masses of the two gases together to determine the combined mass of the mixture.

    Mixture mass = mass of benzene + mass of butylene = 0.87 + 0.625 = 1.495kg

  5. 5

    Divide the combined mass of the gas mixture by the volume of the container that it is in to determine the density of the mixture in the container.

    Density of gas mixture = 1.495kg / 0.5m^3 = 2.99kg/m^3.

    The density of an equal mixture of benzene and butylene gases would be 2.99 kilograms per cubic meter.

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