Eli5: Why is it difficult to breathe when wind is blowing on your face?
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The faster a fluid (gases and liquids are fluids) is moving, the lower it’s pressure. (Assuming no energy is being added, it’s entirely possible to increase velocity and pressure but then you have to add energy to the system, whereas if you lower pressure you can increase velocity without adding energy to the system, oversimplified, but you need to understand that much) If the pressure is lower outside your body than it is inside your body, then the atmosphere is effectively creating a vacuum. So you have to overcome that vacuum to breathe in.
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