Liquidus and solidus are terms used in materials science, particularly in phase diagrams and the study of phase transitions in substances, especially alloys and melts. 1. **Liquidus**: The liquidus is the temperature above which a material is entirely in the liquid state. Below this temperature, solid phases begin to form as the material cools. In a phase diagram, the liquidus line represents the boundary between the fully liquid phase and the mixture of liquid and solid phases.
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