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Chapter 5

A world floating distinctly in space will call itself the only world. - Stephen Crane 1897. Chapter 5. Soil Water. a. b. Structure of water. Fig. 8.2. (a) Structure of water molecule and (b) hydrogen bonding between water molecules. Adhesion & cohesion.

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Chapter 5

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  1. A world floating distinctly in space will call itself the only world. - Stephen Crane 1897 Chapter 5 Soil Water

  2. a b Structure of water Fig. 8.2. (a) Structure of water molecule and (b) hydrogen bonding between water molecules.

  3. Adhesion & cohesion • Adhesion: the attraction of water molecules for solid surfaces • Cohesion: the attraction of water molecules for each other

  4. Capillarity and Water Movement • Soil water exists in small spaces as a film around soil particles • Small soil pores act as capillary tubes • Capillary action holds water in the small pores against the force of gravity • The smaller the pores, the higher the water will rise

  5. Capillarity: a visual

  6. Effect of Soil Texture on Capillary Rise • So capillary rise greatest in fine-textured soils 10 100

  7. Relationship between pore size and height of capillary rise Height of rise doubles when radius is halved Height of rise greater in finer textured soils

  8. Relationship between pore size and RATE of capillary rise Rise is higher, but slower, in finer textured soils

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