This concept covers the thermodynamics of phase changes, specifically how heat energy relates to temperature change and state transitions in a pure substance. During a phase change (fusion/melting or vaporization/condensation), added or removed heat goes entirely into changing the potential energy between molecules (breaking or forming intermolecular bonds/lattice structure) rather than changing kinetic energy, so temperature remains constant; away from a phase change, heat instead raises the average kinetic energy of molecules, causing a temperature change governed by the substance's specific heat. This belongs to the domain of thermodynamics/calorimetry within chemistry and physics, relating heat of fusion, heat of vaporization, and specific heat capacity as substance-specific constants that quantify these two distinct heat-energy relationships.
This concept covers the thermodynamics of phase changes, specifically how heat energy relates to temperature change and state transitions in a pure substance. During a phase change (fusion/melting or…