What type of heat is added to ice that changes it into water without a visible temperature change?

The process of changing ice into water without a visible temperature change involves the concept of latent heat. Latent heat refers to the heat energy required for a substance to change its state—such as from solid to liquid—without changing its temperature. In the case of ice melting to become water, the latent heat absorbed by the ice is used to break the bonds between the molecules in the solid state, allowing them to transition into the liquid state. This process occurs at a constant temperature, which is why no visible temperature change is observed during melting.

Other terms provided in the choices reference different heat transfer concepts. Sensible heat is associated with raising or lowering the temperature of a substance without changing its state, while superheat involves heating a vapor beyond its boiling point without changing to a liquid. Refrigeration heat typically refers to the heat extracted from a substance during the refrigeration cycle. None of these options pertain to the phase change occurring in ice to water without temperature change, reinforcing why latent heat is the correct answer.