evaporation

"Where does the water go?"

The children do an experiment with water to try to figure out what happens to water when it is exposed to the air. Where does the water go? Have they ever

wondered what happens to the water in puddles after it

stops raining?

We use a plastic cup and red tape

to use as a marker.

We mark a water level on the plastic

cup.

We prepare some water.

We fill the cup with water up to the

water level mark.

We put the cup on

a window sill and

observe what

happens.

We put the cup on a window sill and observe what happens. We leave it there for 5 days. Each day we observe

the water disappearing. It is called ‘EVAPORATION’. The water has gone up into the air. Evaporation occurs when the particles of water become warm enough that they turn into vapours and leave the

cup and escape into the air. After 5 days the water has all

disappeared. It has been evaporated.

Day 2

Day 5Day 4

Day 3

The clouds are full of water vapours which have been

evaporated.

We observe the

water.

The cup is empty.

We do other experiments with water. We put wet paper napkins in a plastic bag. Tie it up and put it in a sunny place. The vapours cannot escape from the plastic

bag. We can see the water vapours on the inside of the plastic bag. So the paper napkins do not

dry up and remain wet.

We wet the paper napkins and tie

them up in a plastic bag.

We can see the

water vapours

inside the plastic

bag.

We wet paper napkins

We hang the wet paper napkins near

the plastic bag.

Which paper napkins will dry

first?

The paper napkins

are dry but the ones

in the plastic bag are

still wet.

The water vapours could not escape

from the plastic bag.

Wet

Dry