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Ep 119: Work and Heat: An introduction to thermodynamics (a prelude to Ch 6 of ”The Science of Can & Can’t).

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The First Law of Thermodynamics

Bright sunlight heats sand all day long. Heat gained by the sun during the day is lost by the sand at night. Sunburn is caused by ultraviolet light, UV light, comes down from the sun and it can burn you. But if that UV radiation and the visible light is absorbed by the sand, why can't we get sunburned at night? In fact, it's only irradiated back to outer space as infrared radiation. The overall quantity of energy re-emitted at night has changed - but the quality has been reduced.

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