The undrainable water in sand

摘要: It has long been known to soil science that after water-saturated sand allowed drain freely, a small percentage of fluid (2-3%) is still be found in the sand. This undrainable water, localized on surface particles and at contact points between under negative capillary pressure, studied here as function its tension apparent specific The influence water amount quartz suggests most retained by forces which are presumably near particles. However, some forms layer c. 0.5 µm thick rugose