Have you ever wondered why you can see your breath on a cold day? It's because of condensation. The air you breathe out is warm (close to body temperature) and very moist. When you breathe the warm air out, it immediately cools when it meets the cold air outside and reaches its dew point ( where it can't hold the water vapour ). The water vapour turns back into tiny liquid particles, which clump together to form the mist you see.
If you're curious about more science phenomena, take a look at my science questions series.
Last Updated on September 30, 2025 by Emma Vanstone
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