Free GCSE Physics lesson: Specific Heat Practical
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Free Lessons -> GCSE / Key Stage 4 -> Physics -> Specific Heat Practical

Lesson 18 · GCSE / Key Stage 4 · Physics

Practical method: specific heat capacity

Plan, carry out and evaluate the specific heat capacity practical using energy, mass and temperature change.

Qualification: GCSE Subject: Physics Practical method

Practical skills

Lesson overview

This lesson introduces the core physics idea, the useful equipment and the calculation or data skills used on this page.

FocusSpecific heat capacity practical method and evaluation
Time45-60 minutes
EquipmentInsulated block, heater, thermometer, balance, joulemeter or ammeter, voltmeter and stopwatch.
Practical linkRequired/core practical focus
Maths tagsM1 substitution with units

What you will learn

  • Describe a safe method for measuring specific heat capacity.
  • Use energy = mass x specific heat capacity x temperature change.
  • Identify key control variables and sources of uncertainty.
  • Explain why insulation and repeat readings improve the evidence.

Specific heat capacity method supplied on this page

Use the metal block data and method prompts to practise calculation, graph use and evaluation.

Specific heat capacity practical infographic

Infographic explaining the GCSE Physics specific heat capacity practical, including insulated block apparatus, energy equals mass times specific heat capacity times temperature change, variables, an energy-temperature graph and exam checks.
Use this visual to set up the specific heat capacity practical, calculate c and connect graph evidence to energy transfer.Download visual

Clear explanation

This practical measures how much energy is needed to raise the temperature of a material. You measure the mass, supply energy with an electrical heater and record the temperature rise.

Energy can be measured directly with a joulemeter or calculated from potential difference, current and time. The temperature change must be the final temperature minus the starting temperature.

Insulation reduces energy transfer to the surroundings. Repeats and a graph of energy against temperature change can make the result more reliable.

Key graph

Energy against temperature change graph A straight graph of energy supplied against temperature change rises through the origin, with gradient linked to mass times specific heat capacity. temperature change / degrees Celsius energy / J gradient = m × c
Graph: a steeper line means more energy is needed for each degree of temperature rise.

Worked examples

Calculating specific heat capacity

A 1.5 kg block receives 13 500 J and warms by 10 degrees Celsius.

c = energy ÷ (mass x temperature change)

c = 13 500 ÷ (1.5 x 10) = 900

Answer: The specific heat capacity is 900 J/kg degrees Celsius.

Quick checks

Choose an answer, then check your thinking.

1. Why is insulation used around the block?

2. Which temperature value goes into the equation?

Practice questions

Question 1

A 2 kg block receives 8000 J and warms by 5 degrees Celsius. Calculate specific heat capacity.

Reveal answer and marking guidance

Answer: 800 J/kg degrees Celsius.

Marking: Credit c = 8000 ÷ (2 x 5) = 800 J/kg degrees Celsius.

Question 2

Name the independent variable if a student plots energy supplied against temperature change.

Reveal answer and marking guidance

Answer: Energy supplied.

Marking: Credit the variable deliberately increased or recorded on the x-axis if that method is used.

Question 3

Give one source of uncertainty in this practical.

Reveal answer and marking guidance

Answer: Energy lost to surroundings, thermometer resolution, poor thermal contact or timing uncertainty.

Marking: Credit a realistic source linked to the method.

Question 4

Why should the heater fit closely into the block?

Reveal answer and marking guidance

Answer: To transfer energy to the block efficiently and reduce energy lost elsewhere.

Marking: Credit better thermal contact and reduced unwanted transfer.

Practice ladder

FluencyRecall the key definition, unit, equation or model before using the lesson questions.
ApplicationApply specific heat capacity practical method and evaluation to an unfamiliar device, practical setup or data description.
Practical interpretationUse evidence, graph features, uncertainty, method quality or conclusion wording where the question asks you to evaluate.
Maths skillM1 substitution with units

Answers and marking guidance

The exact practice answers are hidden under each question so you can try first. For this lesson, marks come from using the correct physics model, choosing the right equation where needed, keeping units with values, and explaining changes with precise words such as transfer, resultant force, acceleration, evidence and uncertainty.

Common mistakes

  • Using final temperature instead of temperature change.
  • Forgetting the mass in the equation.
  • Ignoring energy transfer to the surroundings.
  • Writing specific heat capacity without units.

Extension challenge

Explain how a graph of energy supplied against temperature change could be used to find specific heat capacity from the gradient.

Reveal answer

Example answer: A strong extension response names the physics model, uses accurate units and explains why the evidence supports the conclusion.

Exam-board guidance

Short board notes only. Learn the core physics above first.

AQA GCSE Physics

AQA GCSE Physics: often rewards clear physics explanations, correct equations, units and practical evidence for specific heat capacity practical method and evaluation.

OCR GCSE Physics

OCR GCSE Physics: often values precise definitions, clear working, graph interpretation and links between models and evidence.

Pearson Edexcel GCSE Physics

Pearson Edexcel GCSE Physics: often combines the concept with equation use, data handling and practical interpretation.

Eduqas GCSE Physics

Eduqas GCSE Physics: learn the core explanation and practise applying it to unfamiliar contexts, data and practical questions.

WJEC Wales

WJEC Wales: often expects accurate terms, units and evidence-based explanations using the shared physics idea.

CCEA GCSE Physics

CCEA GCSE Physics: connect the idea to your current unit and use the same practical method language your class uses.

Next lesson

Next, continue with Practical: I-V Characteristics.

Previous lesson: Wave BehaviourBack to GCSE Physics lessonsNext lesson: Practical: I-V Characteristics