Simplify the following text for a Grade 9 native English-speaking person.
Original: Derived quantities that specify heat capacity as an intensive property , independent of the size of a sample , are the molar heat capacity , which is the heat capacity per mole of a pure substance , and the specific heat capacity , often called simply specific heat , which is the heat capacity per unit mass of a material .
Simplified: The heat capacity of a single material is called the specific heat capacity of the material .