What temperature changes are those that do not involve the addition or subtraction of heat?

Temperature changes that do not involve the addition or subtraction of heat typically occur during phase transitions, such as melting or boiling. During these processes, the temperature remains constant while the substance absorbs or releases heat to change its state (e.g., from solid to liquid or liquid to gas). This heat is known as latent heat, and it is used to break or form molecular bonds rather than changing the temperature of the substance.