Properties of Matter - Class 6 Science Revision Notes

• Composition of Air
• Components of Air
  • Uses of Oxygen
  • Uses of Carbon Dioxide
  • Uses of Nitrogen
  • Uses of Inert Gases

Composition of Air

Air is a mixture of gases

Air mainly consists of :

• Gases
• Water vapour
• Dust particles

Components of Air

Uses of Oxygen

• Breathing ( Respiration)
• Germination
• Burning ( Combustion)
• Rusting.

Uses of Carbon Dioxide

• Photosynthesis
• Preserve soft drinks
• To make fire extinguishers
• Used in baking
• Used in making dry ice.

Uses of Nitrogen

• Used by plants to make proteins
• Used to preserve semen
• It is taken in through the roots as nitrates. Leguminous plants are able to convert nitrogen to nitrates.

Uses of Inert Gases

• They include Argon, Neon, Helium and Krypton
• Used in electric bulbs and light tubes
• Used in coloured advertising signboards.
• Used in hot air balloons.