11 Water Hydrologic Cycle

11 Water Hydrologic Cycle - Properties of water - Water:...

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1 Water: Hydrologic Cycle Properties of water 1. Shape of the molecule 105 o offset of H causes polarity Hydrogen bonding > attraction of the partial + charge to the partial - charge. 2. Surface tension and capillary action 3. High freezing and boiling points δ - δ + Capillary action Capillary action Boiling points N2 O2 CH4 CO2 H2O -200 -150 -100 -50 0 50 100 Temperature o C Water properties 4. Evaporation liquid H 2 O gaseous H 2 O Heat of vaporization > 540 calories per gram of H 2 O Evaporation cools the atmosphere Water properties 5. Transpiration - Evaporation from leaves Evapotranspiration - The sum of evaporation from the soil and transpiration Stomata
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2 Water properties 6. Condensation gaseous H 2 O liquid H 2 O 540 calories are released as 1 g condenses. Condensation warms the atmosphere Water density 0 4 10 20 0.997 0.9975 0.998 0.9985 0.999 0.9995 1 Density g/cm 3 Temperature o C The hydrologic cycle Earth’s water supply Salt Ice Fresh Water Management 1. Surface water
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11 Water Hydrologic Cycle - Properties of water - Water:...

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