ebullition

The act of boiling.

Suddenly, and at the same moment, the ebullition ceased, and the compound changed to a dark purple, which faded again more slowly to a watery green.

A sudden emotional outburst.

His threats—his severe exclamations were but ebullitions of keen vexation, of agony of mind.

Having vented the first ebullition of his wrath, he despatched a message demanding the surrender of the corporal […].