Water evaporates and becomes water vapor when warmed. The water vapor rises into the air but cools and condenses when it touches cooler surfaces like windows, forming droplets of liquid water. We can see condensation form on mirrors or windows when we breathe out due to the water vapor in our breath condensing on the cool surfaces.

2. We have been doing our water
evaporation experiment.
We know that water changes from a
liquid to a gas called water vapour when
it is warmed.
But where does the water
vapour go?

3. Look at your windows.
Do they look like this?
This is called condensation.

4. The weather
outside is cooling
the window.
When the rising
water vapour
touches the
window it cools
down and
changes.

5. The gas has become a liquid.
There is another quick experiment we
can do to see this happening.
As we breathe
the water in our
bodies comes
out as water
vapour.

6. If we breathe against a mirror or
window look what happens.
The water
vapour in our
breath becomes
wet as it hits the
mirror or
window.
What we can see
is condensation.

7. So, now we know what happens to
the water that has evaporated.
water water condensation
vapour

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