They pump fuel and oxidizer at tremendous pressures into the combustion chamber.

Those designed for oxidizer were rounded; those for fuel had flat surfaces.

Inert helium is used to pressurize the four oxidizer tanks.

The SSMEs would draw liquid hydrogen fuel and liquid oxygen oxidizer from the ET.

In all the stages, the oxidizer tank would have been mounted atop the fuel tank.

Rockets stored the oxidizer in a separate tank from the fuel until the moment of use.

Normal explosives contain a large percentage of oxidizer.

Fuel trucks and oxidizer vehicles were in position.

All of the Merlin engines use rocket-grade kerosene for fuel, and liquid oxygen as the oxidizer.

One ring carried fuel; the other, oxidizer.

SpaceShipOne used nitrous oxide as an oxidizer to enable the combustion of a synthetic rubber rocket fuel.

Fuel and oxidizer trailers were stationed nearby.

SpaceShipTwo will use similar hybrid rocket technology, so-called because of the combination of solid fuel and liquid oxidizer.

As the day wore on, Musk said the four oxidizer tanks and the thruster quads were operating nominally.

Consequently, the piping was oversized for the smaller engines, and could deliver more fuel or oxidizer than necessary.

When rockets blast off, they need to carry not only fuel, but an oxidizer to ignite the fuel.