Air Content

Air content, abbreviated as A, is the ratio of volume of air to total volume of soil.

 

air content formula

\(\large{ A = \frac{V_a}{V_t}    }\)
\(\large{ A = n \; \left( 1 - S  \right)    }\)
\(\large{ A = \frac{ e \;-\; w \; G_s }{ 1 \;+\; e}    }\)

Where:

\(\large{ A }\) = air content

\(\large{ S }\) = degree of saturation (expressed as %)

\(\large{ n }\) = porosity

\(\large{ G_s }\) = specific gravity of soil

\(\large{ V_t }\) = total volume of soil

\(\large{ e }\) = void ratio

\(\large{ V_a }\) = volume of air

\(\large{ w }\) = water content (% moisture contemt)