What is the approximate ratio between the second most abundant gas (O2) and the third most abundant gas (Ar) in dry air?

Answer

Approximately 22:1

The text notes a stark gap between Oxygen (~21%) and Argon (~0.9%), resulting in a 22:1 ratio between the second and third most common gases in dry air.

What is the approximate ratio between the second most abundant gas (O2) and the third most abundant gas (Ar) in dry air?
atmosphereGasesabundance