Latent heat of Fusion is associated with which phase change?

• A. Vapor to liquid
• B. Gas to solid
• C. Solid to liquid
• D. Liquid to gas

Answer: (C)

Latent heat of fusion is the energy required to change a solid into a liquid at its melting point without changing its temperature. This energy goes into breaking the structured bonds in the solid, allowing particles to move more freely as a liquid. An example is ice at 0°C absorbing heat and melting into water at 0°C; the temperature stays the same during melting while the added heat converts solid into liquid.

Thus, the latent heat of fusion is tied to the transition from solid to liquid (melting). Other phase changes—vapor to liquid (condensation), gas to solid (deposition), and liquid to gas (vaporization)—have their own distinct latent heats, not fusion.