Lecture-3-Water--It_42853

Lecture-3-Water--It_42853 - H20 ,...

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H 2 0 e presence of abundant water makes Earth a The presence of abundant water makes Earth a habitable planet because: –I t is required by all life, more than any other substance. –W a t e r is a reactant or product in many metabolic reactions. –I t is the solvent of the natural world; cells are in water. •W a t e r s unique properties are due to the
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Emergent Properties of Water •F o u r emergent properties of water contribute to the habitability of Earth: cohesion, moderation of temperature, •W a t e r is “sticky”: the hydrogen bonding of water H 2 0 evaporates molecules to each other ( cohesion bstances ( dhesion
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Moderating Effect of Water on Earth’s Temperature ater’s high ecific heat eans that it can absorb or lose heat Water s high specific heat means that it can absorb or lose heat with only a moderate change (+/ ) in temperature. Amount of heat for 1 g substance to change temp 1 ° C (water = 1) Water acts as a heat “sink” High specific heat due to H bonding •W a t e r s high heat of Cooler Air Warmer Air g vaporization also helps to moderate Earth’s climate. mount of heat absorbed to
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This note was uploaded on 10/16/2010 for the course HE 012928 taught by Professor Storrs,london during the Spring '10 term at École Normale Supérieure.

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Lecture-3-Water--It_42853 - H20 ,...

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