Which type of heat is added to a substance without a rise in temperature?

Latent heat refers to the amount of heat added to or removed from a substance that leads to a change of state (phase change) without changing its temperature. For instance, when ice melts into water, heat is absorbed during the phase transition, but the temperature of the water remains at 0°C until all the ice has melted. This absorption of heat without a temperature increase is characteristic of latent heat.

In contrast, sensible heat is the heat that causes a temperature change in a substance. Superheat refers specifically to the condition of a vapor that is heated beyond its boiling point. Convection describes the transfer of heat through fluids (liquids or gases) due to the movement of the fluid itself, and is not a type of heat added to a substance without changing its temperature. Thus, latent heat is the correct choice as it encapsulates the idea of heat addition during a phase change, while the temperature remains constant.