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Answer:
A cooling curve is a graph of the variation of the temperature of a sample with time as it is allowed to cool.
The gradient of the cooling curve is related to the heat capacity, the thermal conductivity of the substance and the external temperature. The more heat is required to change the temperature of the substance, the slower it cools, so the smaller the gradient of the curve. The higher the thermal conductivity, the faster heat is transferred, so the faster the substance cools.
Liquids usually have the highest heat capacity of the phases.
The lines are curved because as the substance cools, the temperature difference between the surroundings and the substance is reduced. This reduces the rate at which heat is transferred out of the substance, slowing the rate of cooling.
Explanation: