Final answer:
The heat content of an object is an extensive property, which means it varies directly with the mass of the object. As the mass increases, so does the heat content.
Step-by-step explanation:
The heat content of an object is a(n) extensive property, meaning it changes proportionally as the mass of the object is increased or decreased. A property that depends on the amount of matter present and varies directly with mass is known as an extensive property. Heat capacity is an example of such a property, as it is determined by both the type and amount of substance that absorbs or releases heat. As mass increases, the heat content also increases, maintaining a proportional relationship.