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

Tuesday's first launch attempt was aborted because of low pressure in the combustion chamber.

NPR: SpaceX Makes Progress with Rocket Test

Labour peer Lord Lea accused the government of appointing extra peers since coming to power last May to add pressure on the second chamber and make the case for reform.

BBC: Elected House of Lords 'would cost more'

The first attempt to launch the rocket was halted Saturday when a flight computer detected high pressure in an engine combustion chamber.

CNN: Historic launch of private rocket heralds new era

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.

We variously talked about fitting bicycle valves to the caps and pumping them up, building a hyperbaric chamber to fill the bottles under pressure and finally liquid nitrogen.

CNN: From a voyage of discovery to a real ocean odyssey

The difference between turbocharging and supercharging is simple: a turbocharger boosts engine air pressure by using exhaust gas to power a turbine that pushes more air into the combustion chamber.

FORBES: 2012 Audi A7 Test Drive and Review - High-Tech Meets High Style