I’m bringing this question back, someone posted it 9 years ago and there was one comment that has since been deleted. I need to know so bad. I can’t find the answer ANYWHERE.
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Glass fogs up when it cools down warm moist air below the dew point, which makes some of the moisture in the air settle on the glass. When you exhale slowly, the glass gets lots of time to cool it down. When you blow harshly, the air never gets cooled down much, and you also entrain fresh, drier air which can carry away vapor from any water that is on the glass.
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