Why does cold vapor not fog up glasses?
In: Chemistry
Cold vapor is heavier than air so it falls. Your head has glasses which is high. So if it falls, chances are the cold water vapor doesn’t touch your 🤓
Glasses fog up when they are colder than the air around them. When it cools the air is forced to give up that water which sticks to the nearest surface – the glasses. If the air is colder than the glasses, then the glasses heat the air and the air will actually suck any water off of the surface of the glasses.
When you breathe out cold vapor, like from an electronic cigarette or in cold weather, it doesn’t fog up glasses because it’s already in a fine mist form. This mist doesn’t contain tiny droplets of water like warm breath does, which is what causes fogging. Instead, the cold vapor quickly dissipates into the air without leaving enough moisture to condense on your glasses and make them foggy.
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