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Why do your spectacles steam up, when yo...

Why do your spectacles steam up, when you enter a warm room after being outside on a frosty early morning ?

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(1) On a frosty early morning , the temperature of air outside a warm room is lower than the dew point. (2) Hence, when you enter the room from outside , some water vapour in the room condenses on the glass of your spectacles, i.e., the spectacles 'steam up'.
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