Black Seal High Pressure License Practice Exam

Latent heat refers to the heat absorbed or released during a phase change of a substance without any change in its temperature. This heat is involved whenever a material undergoes a transformation such as melting, freezing, vaporization, or condensation. For example, when ice melts to become water, heat is absorbed without an increase in temperature until all ice has turned to water. Similarly, during the boiling process, water absorbs heat to become steam without a rise in temperature, even though energy is being added. This unique characteristic of latent heat, where temperature remains constant while a phase change occurs, is what distinguishes it from other types of heat.

In contrast, sensible heat refers to heat that results in a change in temperature of a substance but does not involve a phase change, while conductive heat and radiant heat refer to specific methods of heat transfer rather than changes in matter or temperature directly.