2. The anomalous expansion of water
refers to the weird property of cooling
water.
Under normal conditions, we generally
see that on heating water, it expands and
thus the density decreases. And on
cooling, it decreases in size and thus the
density increases.
3. In Anomalous expansion of
water, it expands instead of
contracting at a certain
temperature.
Water only contracts till it
is cooled to 4°C and then
stops.
During this, the water
expands on cooling it to 4°C
to 0°C.
As a result, the density of
the water decreases.
4. There are various use of the Anomalous expansion
property of water.
One of its most important factor is in cold regions,
where the top layer of the pond is freezed whearas
the bottom of the pond is in liquid form where
aquatic animals can survive.
It also helps in weathering of rocks. During
monsoons, water enters in rocks through small
cracks. Then in winter when the temparature drops
to 4°C or less, the water expands and thus breaks
the rocks.
But there is a disadvantage of it also. During winter
when the temp. drops to 4°, the water may expand
in pipes and thus can cause pipe bursts.
