why does water stay cool even on a hot day?
In: Chemistry
It takes a huge amount of energy to raise the temperature of water and that usually comes from the sun. Then there’s night so some of the daily gain is continually lost.
Then, as already stated, evaporation takes away huge amounts of energy, but the temperature for changing from liquid to gas does NOT lower the temperature. This is a scientific law or concept called “heat of vaporization.”
The true reason water feels cooler on hot days is because it *is* cooler than the human body’s temperature. And water has a very high ability to “take heat away” in that situation. After all, it’s why water is used in radiators for cars and cooling nuclear reactors.
Water molecules evaporate and carry away the heat-energy with them. It’s the same reason that sweating keeps you cool on a hot day.
Water is a great insulator.
I think this may be the reason why it stays hot during the night in humid environments in the south, and get’s cool st night in like a desert.
The moisture in the air in the south actually retains heat for the night time, while deserts get very cool at night because there is not air moisture.
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