AFCAT I 2021 Solved Paper

Composition of air in the atmosphere:
According to NASA, the gases in Earth's atmosphere include:
• Nitrogen — 78 percent
• Oxygen — 21 percent
• Argon — 0.93 percent
• Carbon dioxide — 0.0325 percent
• Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapour.