Which heat type is associated with phase changes?

Which heat type is associated with phase changes?

• A. Latent heat.
• B. Sensible heat.
• C. BTU.
• D. Conduction.

Answer: (A)

Phase changes involve latent heat, the energy required to change a substance from one phase to another without changing its temperature. This energy goes into breaking or forming molecular bonds as the material shifts between solid, liquid, and gas, so the temperature stays constant during melting, freezing, vaporization, or condensation. For example, ice absorbs heat and melts at 0°C while its temperature remains at 0°C until all ice becomes water, and water boils at 100°C while it changes to steam. This is different from sensible heat, which changes the temperature of a substance without changing its phase. BTU is just a unit of energy, and conduction is a heat transfer mechanism, not a type of heat associated with phase changes.

Phase changes involve latent heat, the energy required to change a substance from one phase to another without changing its temperature. This energy goes into breaking or forming molecular bonds as the material shifts between solid, liquid, and gas, so the temperature stays constant during melting, freezing, vaporization, or condensation. For example, ice absorbs heat and melts at 0°C while its temperature remains at 0°C until all ice becomes water, and water boils at 100°C while it changes to steam. This is different from sensible heat, which changes the temperature of a substance without changing its phase. BTU is just a unit of energy, and conduction is a heat transfer mechanism, not a type of heat associated with phase changes.