How much does a cloud weight?

Clouds, despite their light and fluffy appearance, are surprisingly heavy. A typical cloud has a volume of around 1km3 and a density of around 1.003kg per m3, which means that a typical cloud weighs around a million tonnes[1][2][3][4][5].

 This is because clouds are composed mainly of air and millions of tiny water droplets, which form when water condenses around a "seed" particle. The weight of a cloud is measured by weighing the water vapor that composes it or by estimating the size and density of the water droplets in the cloud. For example, a typical cumulus cloud contains around 550 tons (499 metric tons) of water, which is approximately the weight of 100 elephants suspended above your head[2]. However, not every cloud is created equal, and different types of clouds have different weights. For instance, cirrus clouds are much lighter, while cumulonimbus clouds tend to be much heavier[2]. Despite their heavy weight, clouds are able to float in the air due to the tiny size of the water droplets and the high-altitude wind currents that blow them along, keeping them in the air for much longer than if they were static[2].