Triangular Plot

http://www.styrenemonomer.org/2.4.1.html

This is an example of a triangular plot graph.  The graph compares three variables inside a shape of a triangle to show the relationship with one another.  The image above compares different percents of volume of three different gases nitrogen, oxygen, and styrene.  The different amount of volume each gas has affects its properties.  For example oxygen and styrene can be flammable at certain volume percentages and also non-flammable.