What is rain?

What is rain?

Rain, rain, go away, come again another day

Drip, drop, drip, drop. Sometimes we like to play in the rain. Sometimes we want it to go away! But how is rain made?

Water vapour, small drops of water, is always present in the air. Hot air can hold lots of water vapour.

When air is warm, it rises. As the air rises, it gets colder. Water starts to condense and become liquid. Clouds are lots of liquid water droplets collected together.

Sometimes mountains cause air to rise and the water droplets in the air to condense.

If the clouds are big enough, drops of water bang together and become even bigger. When the drops get heavy enough, they fall to the ground as rain.

Try making your own rain to see this in action!

Did you know_rain

You can measure the rain with a rain gauge. Compare outside your house with outside a friend's house. Where does the most rain fall?