FLAMING OXYGEN DROPS

摘要

Oxygen is a good thing. Oxygen is life. But if it were much more than one fifth of our air, we'd be in serious trouble. The other four fifths is nitrogen, an almost completely inert, obstructionist gas whose main effect is to get in the way of the oxygen, especially where flame is involved. For every bit of oxygen a fire consumes, it has to heat up and push away four times as much useless nitrogen. With pure oxygen, thai damper is gone, and things that merely smolder in plain air go up like dry tinder. In 1967 three Apollo 1 astronauts died in a raging fire when Velcro lit up in their pure-oxygen pressurized space capsule.rnOxygen in gas form is used for welding and cutting: There's no way to get a flame hot enough to melt steel using plain air. And in liquid form, oxygen is truly ferocious. For example, kerosene burning in air can power a camping lantern; kerosene burning with liquid oxygen powered the Saturn V moon rocket (yes, we made it to the moon on kerosene).