How do clouds form?

Summary

This video explains the process of cloud formation, from the initial warming of the ground to the condensation of water vapor into cloud droplets and eventually rain. It details the role of condensation nuclei and the surprising weight of clouds.

Highlights

What Clouds Are Made Of00:00:04

Clouds are not made of gas, but rather a large mass of tiny liquid water droplets or ice crystals.

Initial Stage of Cloud Formation00:00:13

The process begins with the sun warming the ground, causing the air and water vapor within it to rise and cool.

Role of Condensation Nuclei00:00:28

As water vapor cools, it condenses and sticks to tiny particles in the air, called condensation nuclei (such as salt and dust), which provide a surface for condensation.

Formation of Cloud Droplets00:00:46

When enough vapor condenses around these nuclei, a cloud droplet is formed. These droplets are incredibly small, with 100 million in a cubic meter of air.

Weight of Clouds00:00:55

Despite their small size, a cumulus cloud can weigh as much as 500 tonnes, equivalent to about 100 elephants.

Why Clouds Stay Afloat and Rain00:01:02

Individual water droplets are tiny and spread out, allowing clouds to stay afloat. When droplets combine and become too large and heavy, they fall as rain.