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Combined Science
AQA GCSE Combined Science Trilogy
Chemistry of the Atmosphere
Composition and Evolution of Earth's Atmosphere
Atmospheric Gas Proportions
AQA GCSE Combined Science Trilogy · 8464
Atmospheric Gas Proportions
What you need to know
Describe the proportions of different gases in the Earth's atmosphere, which have remained relatively constant for approximately 200 million years.
Recall that nitrogen constitutes about four-fifths (approximately 80%) of the atmosphere.
Recall that oxygen constitutes about one-fifth (approximately 20%) of the atmosphere.
Identify that there are small proportions of various other gases, including carbon dioxide, water vapour, and noble gases.
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Atmospheric Gas Proportions
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Previous section: Chemical Analysis
Chlorine Gas Test
Next subtopic
The Early Atmosphere
