1. Natural Sciences Grade 7
Term 3: Energy and Change
Heat transfer

2. Natural Sciences - Grade 7
Topic 3 Heat transfer
Conduction
Natural Sciences - Grade 7

3. Natural Sciences - Grade 7
Conduction
Conduction – is the transfer of heat between solid objects that are in direct physical contact with each other.
Heat Energy can be transferred between different parts of an object, or between objects that are touching each other.
In conduction the heat energy travels from the source of heat through the object, or from the warmer object to the cooler object until they have the same temperature.
Natural Sciences - Grade 7

4. Natural Sciences - Grade 7
Conduction
Another example of conduction:
Conduction of heat energy can take place between a solid and a liquid or a gas.
When you make yourself a hot cup of coffee, heat energy is transferred from the hot coffee to the cup and the spoon.
You will observe that both the cup and the spoon become warm.
This is one good example of conduction from a liquid to a solid.
Natural Sciences - Grade 7

5. Natural Sciences - Grade 7
Key Words
Conductors – Substances that easily transfer
heat energy.
Insulators – Substances that do not easily
transfer heat energy.
Natural Sciences - Grade 7

6. Natural Sciences - Grade 7
Key Words
Variables – Factors that can change, are
measurable and observable.
Fixed variables – variables that are kept constant
(the same) whenever the
investigation is being
conducted. [use nails;
paperclips; pins; etc.].
Natural Sciences - Grade 7