Types of Heat Transfer

• Science
• 8th Grade

Lesson 7. 1 - Thermal Energy

Thermal Energy

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1. Picture A has the most Thermal Energy.
2. Picture B has the most Thermal Energy.
3. Picture C has the most Thermal Energy.
4. All the pictures have the same amount of thermal energy

Molecular Motion during conduction:

- During conduction the 

slower-moving

 molecules speed up and the 

faster-moving molecules 

slow down.

 Convection

  - transfer of energy by the movement of heated particles.

- The movements are known as currents that move from warmer to cooler parts of the substance. 

- Occurs in liquids and gases.

 

Molecular Motion during Conduction: 

 - An increase in thermal energy causes the molecules move faster and spread further apart. This causes the density to decrease and the molecules to rise in the current.

- A decrease in thermal energy causes the 

molecules slow down and contract.

 This causes the density to increase and 

the molecules to sink in the current.

Radiation:

- transfer of energy through 

electromagnetic waves.

- Occurs fastest in gases.

- Can be absorbed or reflected.

- Can travel through space and between molecules.

3 Types of Heat Transfer

Practice: 

Click HERE to open Heat Transfer Practice 1. 

Place the answers on the back of your note sheet.