Why do liquids evaporate below their boiling temperature.

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Water’s boiling temperature is 100C or 212F, when you spill some on concrete or leave a cup of water outside, it disappears without it reaching 100C even if it is in the shade. The water from the ocean also evaporates, but it is not boiling. This happens with other liquids to such as isopropyl alcohol, or gasoline.

How does this happen?

In: Chemistry

7 Answers

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Temperature is a measure of the average energy in a group of molecules. A water molecule on the water’s surface can gain enough energy to break off from the surrounding molecules and vaporize into the air. As a result, the temperature of the remaining liquid water will slightly decrease. This is why sweating cools down our skin during exercise. A chemical’s ability to evaporate is called volatility, and is linked to its boiling point. Alcohol and gasoline have lower boiling points than water; they are more volatile.

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