The need for supplemental oxygen is determined by inadequate oxygen saturation, indicated in blood gas measurements, pulse oximetry, or clinical observations.
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Oprah does not own all of the oxygen network. she helped in founding the network and is co-owner of it but does not own all of it. NBC Universal purchased the network in 1997.
Oxygen was named in 1777 by Antoine Lavoisier.
You can test for oxygen by placing a glowing splint (not lit but not out) into the test tube where you think oxygen is present. If the splint relights, that means that it is oxygen. If this doesn't happen, then in your case it will be nitrogen.
oxygen tank
Astronauts bring tanks of oxygen with them when they go into space. The space suits they use to make space walks also have small oxygen tanks on them.