If air content and degree of saturation are represented as ac and S respectively, then the relationship between them is ________
a) ac= 1/S
b) ac=1-S
c) S=1+ac
d) S=ac
Answer: b
Explanation: Air content is the ratio of the volume of air voids (Va) to the volume of voids (Vv). The degree of saturation (S) is the ratio of the volume of water (VW) to the volume of voids (Vv) in a given soil mass.
ac=Va/Vv
S=VW/Vv
Since Va=Vv-VW
ac=1-VW/Vv
ac=1-S.
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