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Water is most dense at 3.98 °C (39.16 °F) at standard atmospheric pressure (not true for seawater). Thus as water cools below 3.98 °C it increases in density and will settle below. As the temperature climbs above 3.98 °C, water density also decreases and causes the water to rise, which is why lakes are warmer on the surface during the summer.
An evaporative cooler (also known as evaporative air conditioner, swamp cooler, swamp box, desert cooler and wet air cooler) is a device that cools air through the evaporation of water. Evaporative cooling differs from other air conditioning systems, which use vapor-compression or absorption refrigeration cycles.
Water is inexpensive, non-toxic, and available over most of the earth's surface.Liquid cooling offers higher thermal conductivity than air cooling. Water has unusually high specific heat capacity among commonly available liquids at room temperature and atmospheric pressure allowing efficient heat transfer over distance with low rates of mass transfer.
It's time to close the pool for winter. Learn the proper way to winterize a pool, including how to drain the pool pump and heater and winterize pool plumbing.
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