Summary
Heat is a form of energy that helps to keep us warm, with the sun being the main source. Temperature measures how hot or cold something is and is measured by a thermometer.
- Heat — form of energy that helps to keep us warm Example: The sun is the main source of heat and light.
- Temperature — measure of how hot or cold something is Example: Temperature is measured by a thermometer.
- Expansion — when a material gains heat and becomes bigger Example: Plastic expands when it gains heat.
- Contraction — when a material loses heat and becomes smaller Example: Plastic contracts when it loses heat.
- Good Conductors of Heat — materials that allow heat to flow through easily Example: Metals are good conductors of heat.
- Poor Conductors of Heat — materials that do not allow heat to flow through easily Example: Air, rubbers, and plastics are poor conductors of heat.
Exam Tips
Key Definitions to Remember
- Heat is a form of energy that helps to keep us warm.
- Temperature is a measure of how hot or cold something is.
- Expansion occurs when a material gains heat and becomes bigger.
- Contraction occurs when a material loses heat and becomes smaller.
- Good conductors of heat allow heat to flow through easily.
- Poor conductors of heat do not allow heat to flow through easily.
Common Confusions
- Confusing heat with temperature as they are related but not the same.
- Thinking all metals are poor conductors because they feel cold.
Typical Exam Questions
- What is the main source of heat and light? The sun is the main source of heat and light.
- How is temperature measured? Temperature is measured by a thermometer.
- What happens to a material when it gains heat? It expands and becomes bigger.
What Examiners Usually Test
- Understanding the difference between heat and temperature.
- Identifying examples of good and poor conductors of heat.
- Explaining the processes of expansion and contraction.