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Components of a soil or material to calculate the gravimetric and volumetric water contents.

On this wiki Va is a mathematical abbreviation for volume of air.


One use for the volume of air is used to calculate the Volumetric Water Content, θ, of a soil or cargo.


The following equation can be used to determine the volume of air of a soil or solid bulk cargo:



Va = volume of air,
ρd = dry density (t/m3 or g/cm3),
ρst = specific gravity or particle density (t/m3 or g/cm3) and
w = net water content by weight (%).

You can also use the calculator provided on the main site by clicking the following link:

See Also[edit]

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