Water vapor, water as a gas, it present in the air all the time and it’s clear. At some level of humidity, the air can’t keep all the water as a gas, you can see this when you put a cold beverage can on a counter and you see water condense on it. When something solid, like the can, isn’t present the water can’t make big drops like that. Instead it makes tiny droplets. You see those in “steam” in the kitchen or shower. Clouds are like fog, tiny droplets in a large volume of the atmosphere.
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