Oxidizer

	Oxidizer
Density	5 kg/l
Transferable	Yes
Tweakable	Yes
Drainable	Yes
Flow mode	Adjacent
Cost	0.18 /l
	0.04 /kg
Since version	0.18

Oxidizer is a resource that fuels liquid fuelled rocket engines. A liquid fuel engine burns 11 units of oxidizer per 9 units of liquid fuel. It was added with version 0.18, prohibiting rocket engines being fuelled by jet fuselages alone.

It is stored in rocket fuel tanks together with the usually correct amount of liquid fuel. During construction in the VAB or SPH, the amount of oxidizer and liquid fuel in a tank can be altered independently of each other. Oxidizer can also be transferred between tanks independently of transferring liquid fuel, so ratios can be thrown off if not done carefully.

Since 1.9, oxidizer can also be drained from tanks using the FTE-1 Drain Valve.

Planes using jet engines don't need, and can't, use oxidizer as they are made to use intake air instead. Note that only Kerbin and Laythe have oxygenated atmospheres, which is necessary for the jet engines to function.