Air is regarded as a mixture because (1) Its pressure may vary. (2) Its temperature may change (3) Its volume change under different conditions (4) Its composition may vary.

Answer: (4)

  • Air is a gas mixture that comprises the atmosphere of the Earth.
  • These gases are colourless and odourless, so we can’t see them, but we can only sense them.
  • The atmosphere is an ocean of these gases.
  • It is made up of 78% nitrogen, 21% oxygen and 1% other gases and water vapour.
  • From place to place, the moisture content varies.
  • As compared to wetlands, arid regions have less moisture content.

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