What would happen if it is hot inside, and cold outside, and then a window is opened?

Answer

If it is hot inside and cold outside and you open a window, the hot air will escape. You will also see some condensation on the window due to the temperature difference. Hot air rises and escapes quickly.
Q&A Related to "What would happen if it is hot inside, and cold..."
Well, as written above, it is a matter of pressure. Without a difference of pressure, the air won't mix. However, for equal pressure, the warmer air will be lighter than the colder
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