Why are humidity and clouds different? Why is one invisible while the other isn’t? And why would humidity not clump together like clouds do?
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Think about humidity as how much water vapors are in the air.
An individual water vapor is essentially invisible but if you get enough of them together you can see them, esp if you change the temperature around the group. Think of your warm breath on a cold day or the steam of a boiling kettle.
Fog is a larger version of the same thing. It’s usually seen in the morning when the coldest part of the night has packed the vapors together but the warm sun is trying to spread them apart.
Fog is just a cloud sitting on the ground.
Just like if you look at your straw in a cup of water it looks like it’s in a different spot, small water vapors do the same thing. So if you have enough together in a cloud, all the water vapor makes the light randomly change directions enough times that it looks opaque.
The wind blows the vapors into groups the same way snow drifts get blown into big piles. When enough vapors get together they form rain and fall from the sky.
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