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

40%

60%

80%

100%

less than specific gravity of soil

equal to specific gravity of soil

greater than specific gravity of soil

independent of specific gravity of soil