The proportions of different gases in the atmosphere (4.9.1.1) — AQA GCSE Chemistry Revision Notes
Revision notes for AQA GCSE Chemistry specification point 4.9.1.1, The proportions of different gases in the atmosphere.
Composition of the Current Atmosphere:
The atmosphere we have today is the result of a long evolutionary process. Currently, it consists of:
- NITROGEN (N₂): Approximately 80%, the most common gas.
- OXYGEN (O₂): Roughly 20%, essential for life as we know it.
- TRACE GASES: These include CARBON DIOXIDE (CO₂), WATER VAPOUR (H₂O), and various NOBLE GASES like Argon, which are present in much smaller amounts.
The current atmosphere has had this composition for the last 200 MILLION YEARS, however it has not always been like this.
Flash Revision Lab — free AQA GCSE Science revision notes, used by 150,000+ students. Rated 4.9/5 on Trustpilot.
