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Gases in the atmosphere
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Dry air and percentage by volume

Dry air and percentage by volume

Air is a mixture of gases, not a single substance. In dry air, water vapour has been removed so the composition can be compared clearly. By volume, dry air is about 78%78\%78% nitrogen, 21%21\%21% oxygen, 0.9%0.9\%0.9% argon, and 0.04%0.04\%0.04% carbon dioxide.

Gases in the atmosphere Lesson

  1. IGCSE
  2. /Chemistry
  3. /Gases in the atmosphere

Step-by-step lessons covering Edexcel IGCSE Chemistry Gases in the atmosphere for IGCSE Chemistry. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Build a solid grasp of atomic structure, bonding and the mole concept early, since these underpin almost every other topic, then move on to the more calculation-heavy quantitative and organic chemistry content.