What does O/N stand for?

O/N stands for "oxygen-to-nitrogen ratio"

How to abbreviate "oxygen-to-nitrogen ratio"?

"oxygen-to-nitrogen ratio" can be abbreviated as O/N

What is the meaning of O/N abbreviation?

The meaning of O/N abbreviation is "oxygen-to-nitrogen ratio"

What does O/N mean?

O/N as abbreviation means "oxygen-to-nitrogen ratio"