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Water as ice has a cooling effect, where...

Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.

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Both ice and steam are the physical states of the same substance i.e. water. However, they differ in their nature. Ice on coming in contact with skin (at a highertemperature) absorbs energy as latent heat of fusion from the skin and melts. Since energy has been taken up from the body, a cooling sensation is experienced. But when steam comes in contact with the skin (lower temperature) it releases energy which causes severe burns on the skin.
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