PPT: Water | Science Class 6 PDF Download

 Page 1


1
WATER
Page 2


1
WATER
2
What is water?
Water is made of tiny molecules of hydrogen and oxygen. 
Each one is so small that you c a n’ t see it even with the most
powerful microscope.
Pure water has no colour, no taste and do es n’ t smell of anything.
Water exists in three forms on the Earth:
> solid (ice, hail, snow or frost)
> liquid (in lakes, oceans, rain, dew, fog or mist)
> gas (steam or water vapour - "invisible" water in the air).
Page 3


1
WATER
2
What is water?
Water is made of tiny molecules of hydrogen and oxygen. 
Each one is so small that you c a n’ t see it even with the most
powerful microscope.
Pure water has no colour, no taste and do es n’ t smell of anything.
Water exists in three forms on the Earth:
> solid (ice, hail, snow or frost)
> liquid (in lakes, oceans, rain, dew, fog or mist)
> gas (steam or water vapour - "invisible" water in the air).
3
Where can we get water?
About 97% of the water on the Earth's surface is in the world's
oceans.
This is where you can find most of the other 3%:
> Lakes
> Rivers
> Polar ice caps
> Clouds
> Rain
> Stored in rocks (aquifers)
> Sea ice
Page 4


1
WATER
2
What is water?
Water is made of tiny molecules of hydrogen and oxygen. 
Each one is so small that you c a n’ t see it even with the most
powerful microscope.
Pure water has no colour, no taste and do es n’ t smell of anything.
Water exists in three forms on the Earth:
> solid (ice, hail, snow or frost)
> liquid (in lakes, oceans, rain, dew, fog or mist)
> gas (steam or water vapour - "invisible" water in the air).
3
Where can we get water?
About 97% of the water on the Earth's surface is in the world's
oceans.
This is where you can find most of the other 3%:
> Lakes
> Rivers
> Polar ice caps
> Clouds
> Rain
> Stored in rocks (aquifers)
> Sea ice
4
Why do we need water?
To carry nutrients and waste in the body.
To lubricate joints, digestive tract and body tissues.
To cool the body, especially during periods of physical activity.
To be used in factories, agriculture, hospitals, hotels, etc.
Page 5


1
WATER
2
What is water?
Water is made of tiny molecules of hydrogen and oxygen. 
Each one is so small that you c a n’ t see it even with the most
powerful microscope.
Pure water has no colour, no taste and do es n’ t smell of anything.
Water exists in three forms on the Earth:
> solid (ice, hail, snow or frost)
> liquid (in lakes, oceans, rain, dew, fog or mist)
> gas (steam or water vapour - "invisible" water in the air).
3
Where can we get water?
About 97% of the water on the Earth's surface is in the world's
oceans.
This is where you can find most of the other 3%:
> Lakes
> Rivers
> Polar ice caps
> Clouds
> Rain
> Stored in rocks (aquifers)
> Sea ice
4
Why do we need water?
To carry nutrients and waste in the body.
To lubricate joints, digestive tract and body tissues.
To cool the body, especially during periods of physical activity.
To be used in factories, agriculture, hospitals, hotels, etc.
5
How much water do we need?
Most people need about 6-8 glasses of water each day.
Inadequate fluid intake can lead to constipation and dehydration.
Caffeine-containing beverages (coffee, tea, colas, etc.) should not be
drunk because caffeine actually causes you to lose water.
More water may be needed during times of fever, or illness.
Athletes should drink additional amounts before, during and after
exercise.