why can combustion cars stop working after driving through flood waters but be okay in heavy rainfall?

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I’ve recently seen on tiktok lots of footage of nice cars driving through flood water, usually they accelerate into it and there’s a surge of water back onto the bonnet but at first thought this seems like the same thing that happens when it rains

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Anonymous 0 Comments

Even in heavy rain, the fraction of air that’s occupied by water (the falling drops) is roughly 1 part per million, leaving plenty of air to burn. In comparison, flood waters are almost entirely water, leaving no air to burn. Cars can keep the raindrops out by keeping the air intake under cover but normal cars (those without snorkels) will suck water once it’s too deep.

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