Aims

1. To investigate the relationship between the heat capacity of an object and the heat transferred per unit temperature change of the object.

2. To infer the specific heat capacity of a substance from the heat capacity of an object of the same substance.

Syllabus Learning Outcome

This lesson exemplar addresses the following learning outcome:

- define the terms heat capacity and specific heat capacity

- recall and apply the relationship

Thermal energy = mass X specific heat capacity X change in temperature

Assumption in the model

heat lost by the solid cylinder to the water is completely gain by the water, in other words, the container containing the water and solid cylinder is a perfect insulator.

Definition Equation 1

The heat capacity, C, of a body is defined as the amount of heat (or thermal energy) required to raise the temperature of a body by 1 [sup]o[/sup]C (or 1 K).

therefore, heat capacity, C (units: J oC-1) = heat transferred (in J) / temperature change (in [sup]o[/sup]C)

Definition Equation 2

The specific heat capacity, c, of a substance is defined as the amount of heat (or thermal energy) required to raise the temperature of a unit mass of the substance by 1 [sup]o[/sup]C (or 1 K).

therefore specific heat capacity, c (in J [sup]o[/sup]C-1kg-1 ) = heat transferred (in J) / temperature change (in [sup]o[/sup]C) x mass of object (in kg)

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