a) volume of voids to total volume
b) volume of voids to volume of solids
c) volume of solids to volume of voids
d) volume of soil mass to volume of voids
Answer: b
Explanation: The volume of voids to the volume of solids is void ratio. The volume of voids to total volume is porosity. The volume of voids includes the volume of air voids as well as the volume of water present.
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