Liquid-fuelled rocket engines work by mixing the fuel (in this case kerosene) with liquid oxygen at high pressure.

ECONOMIST: On a rotor-blade and a prayer | The

The chamber is pressurized with pure oxygen, and the pressure inside the chamber will slowly rise to about two and a half times normal atmospheric pressure.

CNN: Gangrene

The failure caused the cabin to lose pressure instantly and the oxygen masks to deploy.

ECONOMIST: Aircraft fatigue

At higher altitudes, where atmospheric pressure is lower, oxygen enters the body less readily, leading to the hypoxic state.

WSJ: Mayo Clinic Researchers on Everest Study High Altitude's Effects on the Body

Although jets are pressurized so that the cabin environment resembles an altitude of around 8, 000 feet, some people report that flying (possibly from the changes in pressure and resulting decrease in oxygen concentration) causes symptoms such as headache, fatigue and nausea.

CNN: Is it OK to fly after a head injury?

Since the amount of oxygen the paint gets depends on the air pressure, the greater the pressure, the less the paint glows.

ECONOMIST: Pressure paints

The pods are then packed under pressure using carbon dioxide to seal out damaging oxygen.

ECONOMIST: Espresso coffee

The EPA pulled off the feat by sharply increasing the amount of oxygen-poor exhaust that is recirculated into the combustion chamber and increasing the pressure of the fuel being forced into the cylinder.

FORBES: EPA, Inc.

But in pressure-sensitive paints, excited luminescent molecules dump some of their energy into the oxygen in the air in a way that prevents them from lighting up.

ECONOMIST: Pressure paints | The

In many kinds of rock, most notably granite, the application of pressure and the resulting deformation of the rock's constituent crystals turn some of the oxygen atoms in those crystals into charge carriers.

ECONOMIST: Predicting earthquakes