Question

Ethyl chloride (boiling point, 13 C^{\circ} \mathrm{C}) is used as a local anesthetic. When the liquid is sprayed on the skin, it cools the skin enough to freeze and numb it. Explain the cooling effect of liquid ethyl chloride.

Solution

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When ethyl chloride is sprayed on the skin, it takes away the heat that is required to evaporate itself from skin. In this way liquid ether evaporates and cools the skin enough to freeze.

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