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Discovery of Hysteresis in Soil Physics. In 1930 W.B. Haines showed that there is a strong hysteretic effect between the Soil moisture content q and the capillary pressure y.On the Right is a typical hysteresis loop. Water drains along the curve ABC, and re-wets the soil along a different curve CDA.He also was the first to postulate an explanation of why this might happen.Below is a capillary tube with a large pore at the centre with a different radius to the pore throat..

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