why is that even if it’s Super hot and sunny outside, The air will feel cool if you stick your arm out of the window while driving?

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Answer 1

It doesn’t depending on what your definition of “super hot” is. You don’t sense temperature, you sense temperature change. Anything above body temperature, assuming you’re dry will feel warmer. Trying sticking your hand out the window of a car while it’s 120 degrees out, it’s not cooling at all, it feels like a hair dryer.