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Earth systems Chapter 7 - Chapter 7 Water Atmospheric...

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Chapter 7: Water & Atmospheric Moisture I. Water on Earth A. Worldwide equilibrium Hydrologic cycle: the circulation of moisture in the earth system -a continuous interchange of moisture in the earth system B. Distribution of Earth’s water today -Oceans -Lakes -Wetlands -Ice -Snow -Clouds -Water vapor in the atmosphere But the amount of water in each storage varies II. Unique Properties of Water A. Heat properties Water = high specific heat capacity (can absorb lots of energy w/ much increase in temp) -latent heat is required to convert water between its three phases 1. Ice, the solid phase less dense than liquid phase = ice floats on water 2. Water, the liquid phase liquid to solid = energy is released from liquid water does not contract when it gets colder expands when it freezes hydrogen bonding creates surface tension = a skin of molecules giving water a stickiness quality, (insects walk on water) capillarity, water will rise in narrow conduits 3. Water vapor, the gas phase sublimation gas to solid (needs most amount of energy) colorless, odorless, invisible we don’t notice water vapor unless the air is humid & feels sticky About 50% of water vapor is within 1 mile of the earth surface B.
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