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18 On a cold, dry winter day your glasses fog up when you go indoors after being outside for a while. Why is that? And if you go back outside with your glasses still fogged up, they quickly clear up. Why is that?

18

On a cold, dry winter day your glasses fog up when you go indoors after being outside for a while. Why is that?

And if you go back outside with your glasses still fogged up, they quickly clear up. Why is that?

Grade:12

1 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
9 months ago
Dear student

When going from inside to outside, the temperature changes occur that relative humidity of air may around100%100%because of the temperature change air at higher temperature hit the water vapors at low temperature starts to condense. That why fog gets quickly clear up when moving from inside to outside. Similarly for when going from outdoor to indoor temperature changes occur, the air gets starts to condense because of air at the partial vapor pressure. Relative humidity also high in the case. Water vapors also accumulate in the surface of the glass.

Regards

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