A moisture-release curve may be determined
by removing, stepwise, increments of water
and measuring the steady-state soil-moisture
suction that develops. A soil-moisture-adsorption
curve may be determined in the same
way, except that increments of water are allowed
to enter the sample. The failure of these
two curves to coincide is commonly known
as soil-moisture hysteresis (see, for example,
figs. 3 to 6)
