1. Pour some
water into the clear plastic cup or
container.
2. Add some cooking
oil.
3. Leave this
for a few minutes.
After a few
minutes the oil will have risen
to the top of the cup / container. The
oil becomes lighter than the water.
4. Put the cup
of oil and water into the freezer
for a few hours.
5. Remove from
freezer. The oil is now underneath the
water.
Water
becomes a solid when it freezes.
The
water expands when it freezes and
becomes less dense that the oil.
This
causes the water to rise to the top.
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