Did you know? The ACT has a science section that tests skills such as analyzing scientific observations.

Freezing: the substance changes from a liquid to a solid.

Melting: the substance changes from the solid to the liquid.

Condensation: the substances changes from a gas to a liquid.

Vaporization: the substance changes from a liquid to a gas.

Sublimation: the substance changes directly from a solid to a gas without going through the liquid phase.

Deposition: the substance changes directly from a gas to a solid without going through the liquid phase.