The degree of saturation of a soil sample is defined as:
1
the ratio of the volume of voids to the total volume in a soil mass
2
the ratio of the volume of voids to the volume of solids in a given soil mass
3
the ratio of the volume of water present in a given soil mass to the total volume of voids in it
4
the ratio of the porosity to the volume of voids in a given soil sample