The Avrami equation can describe some but not all systems investigated.

The Avrami equation describes how solids transform from one phase (state of matter) to another at constant temperature.

The Avrami equation.

Deviations from Avrami equation.

The simplest derivation of the Avrami equation makes a number of significant assumptions and simplifications:

If the transformation follows the Avrami equation this yields a straight line with gradient n and intercept ln K.

The final relation describing the process is known as the Avrami equation expressed as where k is the rate constant, w o and w L are the masses of the melt at zero time and that left after time t.