F2011GEOG1112AtmosphericMoistureLectureForPam copy

F2011GEOG1112AtmosphericMoistureLectureForPam copy - 1...

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1 Water: Complicator of the Atmosphere, Sustainer of Life
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2 WATER IS W EIRD ! Compared to other molecules, H 2 O: x Boils at a much higher temperature x Melts at a much higher temperature x And so water is present in all three phases on Earth (other hydrogen substances aren’t!)
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3 x Water densest in LIQUID , not solid, form x And so ice floats! This is remarkable! Dense DENSEST Less dense (Analogy with students’ desks in a classroom)
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4 x Phase changes of water involve unusually LARGE amount of energy vs. most other substances’ phase changes x It takes almost seven times more energy to boil water than melt ice. x ENERGY INTO WATER: latent heat of: melting; evaporation (lots of energy into water) x ENERGY OUT OF WATER: latent heat of: freezing (fusion); condensation (releases lots of energy) x Also: sublimation (solid to gas), deposition (vapor to solid)
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5 Demonstration of Big Latent Heating: Sodium acetate solution in hand warmers The “EZHeat” hand warmers I’m passing around have a solution of sodium acetate in them.
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