Physical_and_Chemical_Properties_of_Water_-_Lect03_S10

Physical_and_Chemical_Properties_of_Water_-_Lect03_S10 -...

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1 Physical and Chemical Properties of Water Advanced Environmental Geochemistry – Lecture 3 – Spring 2010
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2 Heat Capacity Heat capacity is the amount of heat required to increase a given quantity of material by a given temperature at constant pressure and volume This is usually expressed as calories per degree Celsius
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3 Confused about Energy Units? For those who want some proof that physicists are human, the proof is in the idiocy of all the different units which they use for measuring energy. -Richard Feynmann The late Richard Feynmann was a Nobel prize winning physicist
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4 Heat Capacity Comparison Substance Heat Capacity (calories/gram) Mercury 0.033382 (at 0°C) Bromine 0.113 (at 25°C) Water 1.00 Ammonia 1.23
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5 Heat Capacity Application Water has a very high heat capacity, but sand, dirt, trees, etc. have a low heat capacity As a consequence, the land heats up during the day and cools at night, while the temperature of the ocean remains constant This explains the direction of sea breezes –the air over land warms (during daytime), pressure drops, and air
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