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School Physics revision notes: (g) Thermal energy stores and heat transfer

GCSE level Physics exam revision notes: Types of energy store

Thermal (heat) energy store defined and examples explained

[Author © Dr Phil Brown PhD: Doc Brown's physics exam revision notes suitable for students of UK IGCSE & GCSE level physics courses, ~ US grades 9-10 physics [energy-0 page updated Mar 6th 2026 *]

[KEY POINTS and learning objectives for this page, after initial notes]

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ENERGY INDEX: Types of energy & energy stores, energy transfers & selected energy calculations

(g) Thermal energy stores

This page will help you answer questions such as ...  What is a thermal energy store?   Can you describe examples of a thermal energy store? How can you increase the thermal energy content of a thermal energy store?

Index of types of energy stores/transfers

Thermal energy and thermal energy stores

All objects above -273oC (O K) has a thermal energy store, however low the temperature!

The hotter an object (the higher its temperature), the more thermal energy the material contains/holds/stores and all hot objects can release thermal energy to the cooler surroundings e.g. a radiator.

Thermal energy can only move from a higher temperature material to a lower temperature material - there must be a negative temperature gradient for a net flow of thermal energy.

Thermal energy is due to the vibration of atoms in solids or the kinetic energy of particle movement in liquids or gases.

Thermal energy - 'heat', is all about the kinetic energy of individual atoms or molecules.

Thermal energy from a thermal energy store can only flow from a higher temperature region to a lower temperature region i.e. from 'hotter' objects to 'cooler objects' whatever the medium of transfer i.e. it can be gaseous, liquid or solid materials.

Increasing an object's temperature increases its thermal energy store.

The increase in the thermal energy store is proportional to the rise in temperature.

See notes on specific heat capacity

Links to sections involving thermal energy

1. Introduction to heat transfer - conduction (and thermal conductivity), convection and radiation

2. Specific heat capacity: how to determine it, use of data, calculations and thermal energy stores

3. More on reducing heat transfer eg in a house and investigating insulating properties of materials

4. Particle theory models: gases, liquid, solid, internal energy, heat transfer in state changes, latent heat

5. The density of materials (including measurements) and the particle model of matter

6. Energy transfer and efficiency - calculations and Sankey diagrams (= energy section 7)

7. Absorption & emission of radiation by materials - temperature & surface factors including global warming

8. Global warming, climate change, reducing our carbon footprint from fossil fuel burning

Extended Key points for Physics - thermal energy store conversions - energy transfers

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 & CIE GCSE physics 9-1 level science examinations.

A comprehensive set of revision notes tailored to the GCSE/IGCSE Physics specifications across major UK exam boards (AQA, Edexcel, OCR, WJEC, CCEA, CIE). These notes cover thermal energy stores, heat energy transfers, and include exam tips to help students secure top marks.

See links to sections involving thermal energy for more detailed notes

Thermal Energy Stores

What is a Thermal Energy Store?

  • A thermal energy store refers to the internal energy of an object due to the kinetic energy of its particles.
  • The hotter an object, the more thermal energy it stores.
  • All objects above absolute zero (-273°C) have thermal energy.

Examples of Thermal Energy Stores

Object Description
Hot cup of tea Stores thermal energy due to high temperature
Heated metal rod Particles vibrate more, increasing internal energy
Human body Maintains thermal energy through metabolism
Radiator Transfers thermal energy to surroundings

Energy Transfers Involving thermal (heat) energy

1. Conduction

  • Transfer of heat through solids.
  • Occurs when vibrating particles pass energy to neighboring particles.
  • Metals are good conductors due to free electrons.

Example: A metal spoon in hot soup becomes warm.

2. Convection

  • Transfer of heat in liquids and gases.
  • Heated fluid becomes less dense and rises, cooler fluid sinks — forming convection currents.

Example: Warm air rising from a radiator.

3. Radiation

  • Transfer of heat via infrared waves.
  • Can occur in a vacuum (e.g. space).
  • Black, matte surfaces absorb and emit radiation best; shiny surfaces reflect it.

Example: The Sun warming the Earth.

See links to sections involving thermal energy for more detailed notes

Key Equations

Equation Description
ΔE = mcΔθ Change in thermal energy = mass × specific heat capacity × temperature change
Q = mL Energy for change of state = mass × specific latent heat

Specific Latent Heat

  • Latent heat of fusion: Energy to change solid ↔ liquid.
  • Latent heat of vaporisation: Energy to change liquid ↔ gas.
  • No temperature change during state change.

Example: Boiling water — energy goes into breaking bonds, not raising temperature.

See links to sections involving thermal energy for more detailed notes

Student Tips for Exam Success

Use the correct terminology: Say “thermal energy store” not just “heat”.

Always identify:

  • The initial and final energy stores.
  • The transfer process (heating, mechanical, electrical, radiation).

Practice diagrams: Label conduction, convection, and radiation clearly.

Common Misconception: Heat is not a substance — it’s a transfer of energy.

Revise definitions:

  • Specific heat capacity: Energy needed to raise 1 kg of a substance by 1°C.
  • Thermal conductivity: How easily heat passes through a material.

 Use real-life examples: Radiators, kettles, insulation, etc.

Examples of thermal energy stores and thermal energy transfers in everywhere in your daily life

See links to sections involving thermal energy for more detailed notes

At Home

  • Heating systems (like radiators or underfloor heating) use thermal energy to keep your home warm.
  • Cooking appliances (ovens, stoves, microwaves) transfer thermal energy to food via conduction, convection, or radiation.
  • Hot water systems rely on thermal energy to heat water for showers, washing, and cleaning.

In the Kitchen

  • Boiling water for tea or pasta involves transferring thermal energy from the stove to the pot and then to the water.
  • Toasters and kettles convert electrical energy into thermal energy to toast bread or boil water.

In Transport

  • Car engines generate thermal energy through combustion, which powers the vehicle.
  • Braking systems convert kinetic energy into thermal energy due to friction.

In Industry

  • Manufacturing processes (like metal smelting or glass blowing) require intense thermal energy.
  • Power stations often use thermal energy (from burning fuels or nuclear reactions) to produce steam that drives turbines.

In Nature and Renewable Energy

  • Solar thermal panels absorb sunlight and convert it into thermal energy to heat water or air.
  • Geothermal energy taps into the Earth’s internal heat for electricity and heating.

Why It Matters

  • It’s essential for comfort, food preparation, transport, and energy production.
  • Understanding how thermal energy works helps us use it more efficiently and sustainably — like insulating homes or using energy-efficient appliances.
  • See links to sections involving thermal energy for more detailed notes

Keywords, phrases and learning objectives on thermal energy stores and thermal energy conversions

Be able to describe and explain what a thermal energy store is and examples of thermal energy stores and energy store transfer can only take place from higher temperature material to lower temperature material (hotter to cooler regions in substances).

WHERE NEXT?

Specific notes on types of energy and energy stores and associated calculations

FULL INDEX of Types of energy & stores - examples compared/explained, calculations of mechanical work done & power notes

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ALL my Physics Notes

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 INDEX ENERGY: Types, stores, transfers, energy calculations

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