Clouds are also just the places in the sky where the water droplets are above a certain size (above that size, [Mie scattering](https://en.wikipedia.org/wiki/Mie_scattering) happens, and you see the droplets as opaque; below it, it doesn’t) . If that water spreads out (by contact with dryer air, for example), the average droplet size will fall, and you’ll stop being able to see them. It doesn’t necessarily mean that the water has somehow vanished.
Edit: Realised I’d misspelled “Mie”
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