Energy transfers in a system: The higher the thermal conductivity of a material the higher the rate of energy transfer by conduction across the material.

Q: How do I revise Energy transfers in a system: The higher the thermal conductivity of a material the higher the rate of energy transfer by conduction across the material. for GCSE?

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Yes. This guide is linked to the Energy transfers in a system: The higher the thermal conductivity of a material the higher the rate of energy transfer by conduction across the material. topic in the AQA GCSE specification.

Thermal conductivity measures how readily energy passes through a material by conduction.

4 key terms

Study notes

From the checked teaching notes for this specification point.

The idea

Thermal conductivity measures how readily energy passes through a material by conduction. A high value means energy transfers quickly for a given temperature difference and thickness; a low value means it transfers slowly. Rate depends on conductivity, temperature difference, thickness and area. For example, a copper rod feels cold quickly because copper conducts at a high rate, while a foam cup keeps tea warm because foam conducts slowly. Compare materials by keeping other variables fixed: same thickness, same temperature difference, same area. Then the material with higher thermal conductivity shows the greater rate of energy transfer.

What earns the marks

Thermal conductivity is a property of the material that indicates how well it conducts energy.
A higher thermal conductivity gives a higher rate of energy transfer by conduction for the same temperature difference and thickness.
Rate also increases with greater temperature difference and greater cross-sectional area, and decreases with greater thickness.
Comparing materials fairly requires controlling thickness, area and temperature difference.
Typical values: metals have high thermal conductivity; gases and foams have low thermal conductivity.

Common mistakes and how to put them right

Saying a high-conductivity material is 'hotter'.
Put it right by saying it transfers energy at a higher rate, not that it has a higher temperature.
Ignoring thickness or area.
Put it right by stating that rate depends on these as well as conductivity.
Confusing thermal conductivity with specific heat capacity.
Put it right by noting conductivity is about rate of transfer, while specific heat capacity is about energy needed per kilogram per degree.

Exam tips

Use the phrase 'for the same temperature difference and thickness' when comparing two materials.
State the direction of transfer: from the hotter region to the cooler region.
If a graph is given, describe the gradient as the rate and link a steeper gradient to higher thermal conductivity.

Try the lesson

The start of the Energy transfers in a system: The higher the thermal conductivity of a material the higher the rate of energy transfer by conduction across the material. lesson, made from checked teaching notes for this specification point.

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A window is made from glass, which has a high thermal conductivity. What happens to the rate of energy transfer by conduction through the glass compared with a material of lower thermal conductivity?

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Key words

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Thermal conductivity

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Rate of energy transfer by conduction

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Controlling variables

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High and low thermal conductivity

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See every definition

Thermal conductivity: A property of the material that indicates how well it conducts energy.
Rate of energy transfer by conduction: Increases with greater temperature difference and greater cross-sectional area, and decreases with greater thickness.
Controlling variables: Comparing materials fairly requires keeping thickness, area and temperature difference fixed.
High and low thermal conductivity: Metals have high thermal conductivity, while gases and foams have low thermal conductivity.

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Study notes

The idea

What earns the marks

Common mistakes and how to put them right

Exam tips

Try the lesson

Have a go first

Key words

Test your understanding of Energy transfers in a system: The higher the thermal conductivity of a material the higher the rate of energy transfer by conduction across the material.

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