ThinkRankHeat
Heat flows from a hotter object to a colder object until temperatures move toward equilibrium. Temperature is measured with a thermometer, while conduction, convection, and radiation describe different ways thermal energy is transferred. Materials respond differently to heating and cooling.
Learning Objectives
- •Distinguish heat from temperature in everyday language
- •Read a thermometer safely and use standard units
- •Compare conduction, convection, and radiation
- •Explain why materials are selected for insulation or heat transfer
Key Concepts
Heat transfer needs a temperature difference
Thermal energy moves spontaneously from a warmer region to a cooler region.
Conduction uses contact
In solids, energy passes through neighbouring particles; metals are generally good conductors and materials like wool reduce transfer.
Convection and radiation differ
Convection transfers heat through moving fluids, while radiation can transfer energy across space without a material medium.
Terminology
Historical Insight
Cooking utensils
Metal bases conduct heat while wooden or plastic handles reduce heat reaching the hand.
Sea and land breezes
Different heating of land and water contributes to local convection patterns near coasts.
Quick Check
Why is touch not a reliable thermometer?
How does convection occur in water?
Why are woollen clothes useful in winter?
How to use this lesson
Read the overview first, then explain the main idea in your own words before checking the key concepts. Use the quick-check questions without looking at the answer. For examination preparation, verify dates, definitions, and syllabus requirements against your official textbook and school or examination-board guidance.