Water

Subject: Science

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Water is the most common substance on the earth. Rain is produced by the condensation of the water vapour present in the air. This note gives us the information about water and properties of the water.

Water

 

Water
Water

Water is the most common substance on the earth. The natural sources of water are rain, rivers, lakes, springs, sea, wells, etc. Rainwater is regarded as one of the purest forms of naturally occurring water. Rain is produced by the condensation of the water vapour present in the air. Nearly one-third of the rainwater sweeps into the ground through soft and loose strata of sand, gravel and chalk and then reaches some impermeable stratum of clay and slate. It remains trapped in this layer and tries to escape out through the small cracks of rocks which we call spring. The water in the well is one example of trapped water below the ground. Water from wells has been used from time immemorial for drinking and irrigational purposes.

Physical properties of water

  • 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.

Chemical properties of water

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  • 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.

 

 

Things to remember
  • The natural sources of water are: rain, rivers, lakes, springs, sea, wells, etc.
  • Rainwater is regarded as one of the purest form of naturally occurring water.
  • The evaporated water vapour is taken to the long distances by the wind and it becomes cloud due to condensation of water vapour.
  • It includes every relationship which established among the people.
  • There can be more than one community in a society. Community smaller than society.
  • It is a network of social relationships which cannot see or touched.
  • common interests and common objectives are not necessary for society.
Videos for Water
Our Thirsty World
The Water Cycle
Questions and Answers
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.

Water is composed of two atoms of hydrogen and one atom of oxygen (H2O).

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