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by PokerPaul on August 1st, 2005

PokerPaul

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Why do we blow on our hands to warm them up but blow on our tea to cool it down?

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  • by Minsoo Kim on August 3rd, 2005

    Minsoo Kim

    When you blow on your hands, you do not blow hard, but you blow
    very gently. In doing so, your hands will get warmer by the steam of
    your breath. You know steam has lots of heat energy in it.

    And when you blow on your tea, you blow rather hard. If you blow on
    a tea, you would replace the very hot and humid air just above the tea
    by your breath and that helps the tea evaporate taking away with heat
    energy in the tea, which makes the tea cooler.

    Comments

    • There is no "steam" in your breath. Steam only exists above 100 C (212 F)

      jwmbiz

      by jwmbiz on October 11th, 2005

    • jwmbiz is way off. All breath contains water vapor which does release heat as it condenses.

      Thom64

      by Thom64 on October 17th, 2005

    • ifyou don't think your breath has steam ,put a glass over your mouth and breath in it. what do you see?

      psychotikid

      by psychotikid on December 21st, 2005

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