Use a large (preferably clear)
bowl and fill it with water.
2. Stir in several table spoons
of salt until it has dissolved.
3. Place the empty glass (small) in
the middle of the large bowl.
4. Cover the large bowl completely
with the saran wrap / cling film so that no air
can pass through.
5. Leave the bowl in the sunlight
for a few days and watch to see what
The heat from the Sun should form
water vapour from the salt water in
the large bowl on the under side of
the saran wrap / cling film.
The vapour then condenses on the
saran wrap / cling film which happens
to be colder and drips as fresh water
into the small glass in the middle
of the bowl.
There shouldn't be any salt in the
This experiment works well on a really hot and sunny day. Try doing this experiment outside
in an open sunny spot.