Why can I see my breath when it's cold?

1. 1

   Roo says

   Your breath is warm and damp. It has water in it, as a gas too tiny to see. When you breathe out on a cold day, the cold air cools that gas quickly. It turns into lots of tiny drops of water, and they make a little misty cloud you can see!

   For ages 4–7
   Hear Roo

   Checked against Everyday winter mysteries (Library of Congress)

2. 2

   Why don't I see it on a warm day?

   Warm air can hold lots of invisible water. Cool air can hold much less. On a cold day, your breath suddenly has more water than the cold air can hold, so the extra turns into drops. Real clouds form the same way, high up where the air is cool.

   For ages 6–9
   Hear Roo

   Checked against Clouds (Met Office)

In Lil' Phil, reaching the bottom of this wonder earns a sticker for Roo's collection.

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