On a cold, dry winter day your glasses fog up when you go

On a cold, dry winter day your glasses fog up when you go

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?

Problem # 19

In an astronaut training exercise, an airplane at high altitude travels
along a circular arc in order to simulate weightlessness for its
passengers. Explain how this is possible.

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