Vaihedemonstraatio

Vaihedemonstraatio is a term used in Finnish educational discourse to describe a demonstration that illustrates phase-related phenomena in physical systems. The word is formed from vaihe meaning "phase" or "stage" and demonstraatio meaning "demonstration." In practice, it refers to visual and hands-on activities designed to show how external parameters such as temperature, pressure, or energy input influence a system's phase or phase relationships.

Common contexts are physics, chemistry, and materials science, where a vaihedemonstraatio might depict solid–liquid–gas transitions, phase diagrams, or the concept of phase angles in oscillatory systems. The aim is to provide intuitive understanding alongside theoretical explanations.

Typical demonstrations include melting ice and boiling water to illustrate solid–liquid and liquid–gas transitions, sublimation of dry ice to demonstrate solid–gas behavior, and simple experiments that show shifts in phase boundaries on a phase diagram.

The term is not standard in international physics literature; it is most commonly used in Finnish teaching resources. Definitions and scope may vary by school or curriculum.

See also: phase transition, phase diagram, demonstration (education).