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Physics Notes: Thermal energy 1.2 Thermal energy transfer by conduction

GCSE level physics exam revision notes on thermal energy 1

Part 1.2 Thermal energy transfer by conduction due to the kinetic energy of vibration of particles in solids or collision of particles in gases and liquids

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INDEX for physics notes on thermal energy transfer by conduction, convection and radiation

1.2 Thermal energy can be transferred by conduction - vibration or collision of particles

  • Conduction involves heat transfer by particles vibrating against each other in a solid or collisions between particles in a gas or liquid. Conduction is the main mode of heat transfer in a solid.

  • Particle theory: In a solid the hotter particles vibrate more strongly, having a greater kinetic energy (KE) store and bang into neighbouring cooler lower KE particles and so transfer KE to them, so heat energy is transferred from a higher temperature region to a cooler region in any solid material.

    • This kinetic energy of vibration is referred to as thermal energy store. In other words the higher the temperature of a material the more 'thermal energy' it contains.

    • There is no effective heat transfer by convection or radiation within a solid material.

  • The more dense a material, generally speaking the better the conductor - the faster heat energy is conducted.

    • In materials where the particles are further apart the rate of heat transfer (rate of conduction) is reduced eg gases like air are much poorer conductors than solids like stone.

  • Most non-metallic materials are poor conductors of thermal energy (good heat energy insulators) eg water, fat (in animals), wood, stone, concrete, plastics - particularly foams where poorly heat conducting gases are trapped giving even better insulation that the bulk solid plastic - and cheaper by using less material.

  • Metals are particularly good conductors of thermal energy because of free moving electrons - a different heat transfer mechanism to that described here, which applies to all solids. Because the electrons are free to move in the solid metal, they can rapidly transfer kinetic energy by particle movement.

    • The 'hot' electrons in the higher temperature region collide with neighbouring cooler electrons and so rapidly transferring heat energy (KE) - much faster than vibrating atoms in non-metals which are held in fixed positions.

    • Incidentally if you pick up a cold poor conductor like a stone and then pick up an equally cold metal object at the same cool temperature, the metal object feels colder (but it isn't) because it conducts heat from your fingers faster than the stone!

  • Water in an electric kettle is a two part system, but even though the kettle contains the water, it is NOT a closed system because electrical energy is coming in, and being changed to thermal energy by the electrical resistance of the heating element.

    • The heat energy conducts through the heating element and into the water whose temperature rises as its thermal energy store increases. However, the heat is then transferred to all the water by convection currents coming from the hottest least dense water by the heating element which then rises and circulates around (see convection below).

    • BUT, you cannot stop some thermal energy escaping from the kettle by conduction through the case, convection through top opening and radiation from the kettle's surface. These heat losses will be minimised by the design of the kettle e.g.

      • Plastic is a poor conductor.

      • A silver surface is a poor radiator.

  • In a toasted sandwich maker the heat is transferred to the bread by conduction. In the toaster the electrical energy is converted into heat and the thermal energy stores of the toaster and the sandwich are increased to effect the cooking.

  • A measure of good/bad a material is at conducting heat is called its thermal conductivity.

Notes on thermal energy transfer by conduction, convection, radiation

Key points Thermal energy transfer: Thermal energy transfer by conduction

Information sources for Doc Brown's key points: IGCSE-GCSE physics are based on textbooks & syllabus-specifications for students taking the UK AQA, Edexcel, OCR 21st Century Science, OCR Gateway science suite, WJEC, CCEA and CIE GCSE physics 9-1 level science examinations

A structured set of summary revision notes on thermal energy transfer by conduction, tailored to the major UK GCSE/IGCSE physics exam boards: WJEC, CCEA, CIE, AQA, Edexcel, and OCR.

Thermal Energy Transfer by Conduction

  • Conduction is the transfer of thermal energy through a material without movement of the material itself.
  • It occurs mainly in solids, where particles are closely packed and can transfer energy via vibrations or free electrons (in metals).

Typical Core Academic Content Across Exam Boards about conduction of thermal energy

Concept Description
Definition Transfer of thermal energy through a solid by particle vibration or electron movement
Where It Occurs Mainly in solids; especially metals due to free electrons
Mechanism Vibrating particles transfer energy to neighbours; in metals, free electrons carry energy faster
Direction of Transfer Always from hotter to cooler regions
Thermal Conductivity Measure of how well a material conducts heat (units: W/m·K)
Good Conductors Metals like copper, aluminium, silver
Poor Conductors (Insulators) Materials like wood, plastic, air, wool
Applications Saucepan bases (conductors), handles (insulators), building insulation

All boards include this under energy transfers, often in the P1 or Energy topic. CIE and Edexcel IGCSE also emphasize thermal conductivity and practical investigations.

Student Tips about conduction of thermal energy

  • Use particle models: Visualize how energy moves through solids.
  • Revise conductivity examples: Know which materials are good/bad conductors and why.
  • Understand insulation: Link low conductivity to energy efficiency in homes.
  • Practice experiments: Learn how to compare conductivity using wax and metal rods.
  • Link to energy stores: Conduction transfers energy from a thermal energy store.

Common Misconceptions about conduction of thermal energy

  • “Conduction happens in liquids/gases”: It’s mainly in solids; liquids/gases transfer heat via convection.
  • “Heat moves randomly”: Energy always flows from hot to cold.
  • “All solids conduct equally”: Metals conduct well due to free electrons; non-metals do not.
  • Confusing conduction with convection/radiation: Each has a distinct mechanism - don’t mix them up!

Everyday examples of thermal energy store transfers

Conduction is everywhere once you know what to look for! Here are some practical, everyday examples of thermal conduction that you’ve probably experienced without even realizing it:

Kitchen and Cooking

  • Metal spoon in hot soup: The spoon heats up from the soup, transferring energy to your hand.
  • Cooking with a pan: Heat from the stove conducts through the metal pan to cook food evenly.
  • Ironing clothes: The hot iron transfers heat to the fabric via conduction.

Elsewhere Around the House

  • Touching a hot radiator: Heat conducts from the radiator to your skin.
  • Walking barefoot on cold tiles: Your feet lose heat to the floor through conduction.
  • Holding a hot mug: The heat from the drink conducts through the mug to your hand.
  • Using a hot water bottle: Heat transfers from the bottle to your body, soothing sore muscles.

In Vehicles

  • Heated car seats: Warmth conducts from the seat to your body.
  • Engine heat: Heat conducts through metal parts, which is why engines need cooling systems.

Cold Examples

  • Touching an icy window or a cold metal object: Your hand feels cold because heat is conducted away from it.
  • Why metals feel colder than wood: Metals conduct heat away from your skin faster, even if both are at room temperature.
  • Holding a metal water bottle: The cold metal conducts heat from your hand, making it feel chilly.
    • Thermal paste in computers: Used to conduct heat from processors to heat sinks efficiently.

Keywords, phrases and learning objectives for thermal energy (heat) transfer by conduction

Be able to describe and explain examples of thermal (heat) energy transfer by conduction.

Know this transfer is due to the kinetic energy of vibration of particles in solids against each other or particles in gases and liquids colliding with each other.

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Notes on thermal energy transfer by conduction, convection, radiation

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