Points to Remember: • Water is the source of life for all living beings. • Water occurs in all the three states of matter i.e. ice, liquid water and water vapours. • Water found in nature (i) oceans and seas (ii) rivers and lakes (iii) springs and wells (iv) rain. • Rainwater is the purest form of water. Sea water is very impure. • Potable water should be free from suspended impurities and harmful germs. • Water is a compound, with the molecular formula is H2O. • The boiling point of water is 100°C and the freezing point is 0°C. • 0°C is also called tripple point, because water can exist in all its three states. • The specific heat of water is higher than that of any other liquid. It is used as a cooling agent. • Water has minimum volume and maximum density at 4°C. This is called anomalous behaviour of water. • Water is an universal solvent. The gases dissolved in water have biological i...
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