Actual water vapour – water in the form of gas – is invisible. It’s also known as humidity.
What you see from above a pan isn’t the water vapour itself, its many tiny drops of liquid water floating around in the air, like a cloud. These are created when water vapour cools down.
So when the heat is high there’s of heat that stops the water vapour condensing into visible drops just above the pan, and the hot air moves faster to spread the water vapour out more. If it’s spread out enough it won’t turn into droplets.
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