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THANK YOU AND HOPE ALL

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by

sayuj jain

on 1 September 2015

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Transcript of THANK YOU AND HOPE ALL

By Shahid
Sayuj
Mohit
Arwa
Lakshya
Sritha
Ritsika

Water
IMPORTANCE OF WATER

Water is important because:-
Water is one of the most important substances on earth. All plants and animals must have water to survive. If there was no water there would be no life on earth. Apart from drinking it to survive, people have many other uses for water.

Thank you!
Why is water important?
Water has many other uses:-
It is essential for cooking and washing.
It is used in dams to generate electricity.
A large amount of water is used in agriculture and industries.
Water is also used as a medium of transport.
Water is also the home of many plants and animals.
What are its uses?
States of water
Water can occur in three states: solid (ice), liquid, or gas (vapor).

Ice
is water in the solid state.

Water
that you drink is in the liquid state.

Steam
is water in the gaseous state.
• In nature, water exists in the solid state as snow on high mountains.
• Most of the water on the earth exists in the liquid form-in rivers, lakes, seas and oceans.
• In the gaseous state, water exists as water vapour in the air.

Change of state
The state of water can be changed by changing the temperature that is by heating or cooling.
Water freezes to form ice

When water is cooled,it forms ice. This is known as
freezing
of water.

Ice melts to form liquid water
When ice is heated, it melts quickly to form water. This is known as
melting
of ice.

Water evaporates to form water vapour
When water is heated, it changes to form water vapour, a gas. This is known as
evaporation
. A hot liquid evaporates faster than a cold liquid.

Water vapour condenses to form water
When water vapour is cooled, it changes back to water. This is known as
condensation.
CHANGE OF STATES
Full transcript