a) volume of air voids to total volume of the soil mass
b) volume of air voids to volume of total voids
c) volume of air voids to volume of water
d) volume of voids to total volume of the soil mass
Answer: b
Explanation: The air content is defined as the ratio of the volume of air voids to the volume of total voids. It is related with the degree of saturation S as ac=1-S.
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