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An intensive property is a property that depends on the amount of substance that is being measured. Extensive properties lack this substance measurement. We use the specific heat capacity as an intensive property because we can measure how much a a substance is involved in a calorimetry experiment and have a value that can be used in conjunction with this physical amount. The specific heat capacity is the heat capacity divided by the amount of substance present in the experiment transforming it from an extensive to an intensive property.
Heat capacity is the amount of heat required to change the temperature of an object by a certain amount. On the other hand, specific heat capacity is the amount of heat needed to raise the temperature of an object per unit mass of that object. We can see that heat capacity is an extensive property, meaning that it depends on the amount of substance present. The larger the sample, the more heat is required to raise the temperature by a given amount. However, specific heat capacity is an intensive property that does not depend on amount present.
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