Flammability diagram

Flammability diagrams show the control of flammability in mixtures of fuel, oxygen and an inert gas, typically nitrogen.

Mixtures of the three gasses are usually depicted in a triangular diagram, known as a ternary plot.

[1][2][3] The same information can be depicted in a normal orthogonal diagram, showing only two substances, implicitly using the feature that the sum of all three components is 100 percent.

The diagrams below only concerns one fuel; the diagrams can be generalized to mixtures of fuels.

The easiest way to understand them is to briefly go through three basic steps in their construction.