Q:

# What is the density triangle?

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The density triangle, sometimes called the mass-volume-density triangle, is a graphic aid that is intended to make calculations of any of the three variables easy once the other two are known. To use the density triangle, one variable, representing the value to be calculated, must be covered. This gives the relationship between the other two variables and serves as a reminder of the operation that determines the unknown value.

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The density triangle is laid out in three sections with mass in the top area. The area beneath mass is divided between density and volume. If density and volume are known, covering the mass section leaves the two bottom sections, one next to the other, indicating that density must be multiplied with volume to yield mass. This operation works in reverse, with volume multiplied by density.

To determine either density or volume, the undefined variable must be covered. This leaves mass and the other defined factor, either density or volume. In either case, mass is on top, which indicates that the unknown variable, density for example, must be the dividend of mass over volume, or mass divided by volume. Again, this also works for mass divided by density to yield the volume.

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