Directly proportional

Definition

When two quantities change together in such a way that if one quantity doubles, then the other quantity also doubles, and if one quantity triples, then the other quantity also triples.

Related terms

Rate of disappearance:

The speed at which something is disappearing or decreasing over time.

Concentration:

The amount of a substance in a given volume or space.

Differential equations: Mathematical equations that involve an unknown function and its derivative(s).