REN R210 Lecture Notes - Lecture 9: Van Der Waals Force, List Of Lakes By Volume, Hydrogen Bond
27 Sep 2016
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Document Summary
Gravimetric water- ( g): mass of soil water as a percentage of mass of soil solids. Volumetric water- ( v): volume of soil water as a percentage of volume of soil solids. 1-5 hours to go from saturated to unsaturated conditions depending on drainage. 1-3 days post rain to become fully dry, depends on vegetation, drainage. Over time there will be lower soil water content, so water left in the soil becomes more difficult to remove. Density of h2o= 1g/cm^3 at 4 degrees celsius. Weak binds- van der waal forces- dipole moment where proton end is a little bit positively charged and. O end is a little bit negatively charged, electrostatic properties creates hydrogen bonding. Hydrophylic- water loving: glass, sand capilliarity-> alpha of <90 degrees. Hydrophobic- water hating: wax capilliarity-> alpha of >90 degrees. Soil is made up of predominantly hydrophilic surfaces (sand=glass) Coarse textured soils- small h, dominated by macropores. Fine textured soils- large h, dominated by mesopores.
