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Maybe youâre asking why it makes a difference whether the explanation of an event is correct or not. After all, the result is the same. Heated air does expand (usually) and hot air does rise (no matter what the cause). Well, it doesnât make a differenceâunless you want scientific concepts to make sense.
Relevance. Rating Newest Oldest. Best Answer: In heating and cooling curves, the flat portions of each curve indicate the change of phase of the substance. In a heating curve, the substance is heated usually when it is in the solid phase until it becomes a gas at the end. Heating involves addition of heat energy. When heat is added, it usually increases the average kinetic energy of the molecules of that substance making its temperature go up.