Water forms an integral part
of human life. A major portion of the earth’s surface
is covered by water yet less than one percent of the total
water is available for drinking. Water constantly changes
its forms and is available in solid, liquid and gaseous
state. It evaporates and moves in the atmosphere in the
form of water vapour and then comes down again in the form
of rain and snow. Thus its formation is cyclical in nature.
Different States of Water: -
1. SOLID STATE:- The solid
state of water is commonly known as Ice and it forms when
water is frozen at a temperature below 00 C. Ice occupies
more volume that water but is less dense and hence floats
in water. This property helps ice to act as a protective
layer on pools and other water bodies when the temperature
drops allowing water beneath the ice to remain liquid and
fishes and other living species to survive.
2. LIQUID STATE:- Water appears
to be in liquid state when the temperature is between 0
to 1000 C. On the surface of rivers, ponds etc. fresh water
is found. Waters in oceans and seas contains salts and therefore
cannot be utilized for drinking.
3. GASEOUS STATE:- Water Vapour
is the gaseous form of water found in the atmosphere.
WATER- Some Interesting Facts:-
* Although the Earth’s surface
is covered with 75% of water, around 97% of the total water
is in the ocean, 2% of the balance water is frozen which
leaves us with only 1% for drinking.
* 75% of the
human body is made up of water for eg. Blood in our body,
our brain, lungs are all made up of water.
* Upto 6 ltrs
of water can be wasted in a day by a dripping tap.
* 2 ltrs of
water is what our bodies requires every day in summer.
* The earth’s
surface is covered with 10% of ice