Clouds may look light and fluffy, but they are far from weightless. Scientific studies show that a typical cloud can weigh around a million tonnes due to its enormous volume and the water droplets it contains. Despite this massive weight, clouds float in the sky because their density is slightly lower than the surrounding air and because of rising air currents that keep them suspended. Different cloud types vary in weight, with storm clouds being much heavier than wispy high-altitude clouds. This fascinating balance of physics and nature explains how clouds stay afloat despite their incredible mass.