Chemistry

Roles: reagent, solvent, solution, concentration, reaction, catalyst, precipitate, titrant, equilibrium

The science of substances, their properties, and transformations. As a source domain, chemistry provides metaphors for controlled transformation, measured dosage, reactions that require precise conditions, and the distinction between stable and volatile states. The frame’s structural productivity comes from its vocabulary of gradual change under controlled conditions — titration, dilution, catalysis — and the insight that the same substance at different concentrations can be medicine or poison.

As Source Frame (1)