The natural sources of water are rain water, rivers, lakes, springs, sea, wells, etc.
Rainwater is regarded as one of the purest form of naturally occurring water.
The physical properties of water are:
- Pure water is colourless, tasteless and has no smell.
- Water can be found in three state solid, liquid and gas.
- Water is transparent.
- Melting and boiling point of water is 0oc and 100oC respectively.
- Water has no definite shape.
- Water retains heat, so its temperature falls slowly.
The chemical properties of water are:
- Water is formed from two atoms of hydrogen and one atom of oxygen (H2O).
- Water is neutral. It has neither basic or nor acidic properties.
- Temperatures of 212°F (or 100°C) are required to break the hydrogen bonds and convert liquid water into water vapor.
The melting and boiling point of water is 0oC and 100oC.