Ever since I was a kid I always wondered how people are not suffocating from staying in their house. Like if all windows are closed how does air get in? Wouldn’t we just breath up all the available air in a matter of hours and die? Same goes for cars too. If I’m on a long road trip and the windows are closed how am I still alive?
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It’s all about **equalizing the pressure**. **Air infiltration** is a macroscopic process that occurs at the level of molecules. When the pressure outside is higher than the pressure inside(and vice versa), the molecules will naturally move from the outside to the inside through **any gaps or cracks**. This movement of molecules is driven by the difference in **pressure** between the two sides, and it is governed by the laws of **thermodynamics**.
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