Why do clouds look white or gray?
Cloud Color Party
Why do clouds look white or gray?
Look up on a cloudy day and you'll see white puffs drifting across the sky — or dark gray ones threatening rain. But here's the weird part: clouds are made of water, and water is clear. So why aren't clouds invisible?
The secret is in the size of the water drops. A cloud isn't one big blob of water — it's trillions of tiny droplets, each smaller than the period at the end of this sentence. Light from the sun travels in waves, and when it hits something very small, it bounces.
