Did you know: an average cumulus cloud can weigh around 1.1 million pounds (about 551 tons) within a single cubic kilometer
an average cumulus cloud, a typical fluffy cloud seen on sunny days, can weigh around 1.1 million pounds (about 551 tons) within a single cubic kilometer, according to some scientific resources. This weight is due to the billions of water droplets and ice crystals suspended within the cloud. Despite this immense weight, clouds float because the air around and beneath them is denser, creating buoyancy
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It is perhaps easier to comprehend if you realise that effectively, it is not the cloud that is floating but each and every microscopic droplet floating on its own in company with all the others.
It is a heck of a lot water, too. If my arithmetic is correct, just 1mm of rain gives 1000m^3 of water per square kilometre - weighing 1000 tonnes.
