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Water – An Introduction

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