POWERPOINT PRESENTATION

SUBMITTED BY,

RAJITHA.G.R

PHYSICAL SCIENCE

KUCTE KUMARAPURAM

REG NO -13971016

WATER

WATER

Two third of the earth`s surface is covered by water.

The major constituent of all living things is water.

Nearly 98% of water on earth is in the sea.

Water is the most common fluid in nature.

Different states of water

Water exist in three formsLiquid stateSolid stateVapour state

Physical properties of water

Boiling point of water is 100 degree Celsius.

Freezing point of water is zero degree Celsius.

Colourless and Odourless. Water is a good conductor of

electricity.

Hardness of water.

Water in which soap does not easily dissolve and form lather is called hardwater.

Hardness of water due to bicarbonates of calcium and magnesium.

Hardness which can be removed by boiling is called temporary hardness.

Hardness that cannot be removed by boiling is called permanent hardness.

Purification of water

The amount of water we waste is almost the same as the water we use.

The main reasons for the storage of water are unplanned irrigation, wasting and pollution.

Scarcity of water can also be solved to a certain extent by purifying the polluted sources of drinking water.

Different stages of purification

Screening Storage Aeration Filtration Sterilisation

SCREENING

Solid impurities are removed in this stage. Waste water is passed through net and large

sized impurities are removed.

STORAGE

Filtered water is allowed to remain in the reservoir for a long time.

UV rays of the sun destroy the germs in the water.

AERATION

The oxygen content of impure water is kept steady in this stage.

The water in the reservoir is allowed to come in to contact with air by spraying it into another tank.

FILTRATION

Water Is Filtered By Passing Through Sand And Gravel.

STERILISATION

Chlorine is passed through the water to kill the bacteria that may still be present in the water.

Water is now purified and can be used again.

THANK YOU