Unit weight of dry soil is greater than unit weight of wet soil.

For dry soils, dry unit weight is less than total unit weight.

Unit weight of soil increases due to submergence in water.

Unit weight of soil decreases due to submergence in water.

never be greater than unity

be zero

take any value greater than zero

take values between 0 and 1 only

1.0 and 0.0

0.0 and 1.0

0.5 and 1.0

1.0 and 0.5

one phase system

two phase system with soil and air

two phase system with soil and water

three phase system

lD>0

ID>0

0 < lD < 1

0 < ID < 1