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Physics Notes: Thermal energy 2.4 Measuring specific heat capacity of a liquid

GCSE level Physics exam revision notes on specific heat

Thermal energy - specific heat capacity: part 2.4 Measuring directly the specific heat capacity of a liquid like water

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2.4 Measuring directly the specific heat capacity of a liquid like water

You can use a similar set-up to that described above for measuring the SHC of a solid block.

Instead of the block you can use a polystyrene cup (good insulation) with a lid.

Measure a mass of liquid into the polystyrene cup = mass of cup + liquid - mass of empty cup (measured on a mass balance).

You can use water for convenience.

Place the cup in an insulated box or beaker.

The double thermal insulation is essential to minimise the loss of heat energy to the surroundings.

The procedure is then identical to that described for a solid described in part 2.3.

In SHC experiments you can include in the power supply circuit a joulemeter to measure the energy transferred, which makes the calculation a lot easier.

By using a joulemeter you don't need the voltmeter and a ammeter, plus the extra calculation.

energy transferred =

mass of water x specific heat capacity of water x temperature rise

energy transferred =

∆E (J) = m x c x ∆θ = mass of water (kg) x SHCH2O (J/kgoC) x ∆T

rearranging gives: SHCH2O = ∆E / (mass of water x ∆T)

Let the temperature rise a good 10 degrees and repeat the experiment at least twice to get an average - for the most accurate result.

If you have no joulemeter, then, as in the diagram, take measurements from a voltmeter and ammeter.

The use the equation: total energy transferred

Energy (J) = P (W)  x t (s) = I x V x t = current (A) x p.d. (V) x time in seconds

 

See 2.2 for Examples of worked out practice questions involving specific heat capacity and its measurement

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Key points Specific heat capacity: Measuring the specific heat capacity of a liquid

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

Here's a structured set of summary revision notes on how to directly measure the specific heat capacity of a liquid (e.g. water), tailored to the major UK GCSE/IGCSE physics exam boards (WJEC, CCEA, CIE, AQA, Edexcel, OCR), with student tips and common misconceptions to support exam success.

Measuring Specific Heat Capacity of a Liquid (e.g. Water)

Key Equation: c = E / mΔθ,  where:

Apparatus for measuring the specific heat capacity of a liquid

  • Calorimeter or insulated container
  • Known mass of water
  • Electric immersion heater
  • Thermometer
  • Stopwatch
  • Ammeter and voltmeter (if power not known)
  • Power supply
  • Balance (to measure mass of water)
  • Lid and insulation (to reduce heat loss)

Method Overview for measuring the specific heat capacity of a liquid

  1. Measure mass of water using a balance.
  2. Record initial temperature of the water.
  3. Switch on heater and start stopwatch.
  4. Record voltage and current (if power is unknown).
  5. Monitor temperature rise at regular intervals.
  6. Calculate energy transferred:
    • If power is known: E = P x t
    • If not: E = IVt
  7. Calculate SHC using the main equation above.

Typical Exam Board Requirements for measuring the specific heat capacity of a liquid

Required Knowledge
Required practical; calculate SHC; evaluate method and errors.
Describe method; apply SHC formula; understand energy transfer.
Explain setup; calculate SHC; discuss insulation and heat loss.
Describe experiment; apply SHC formula; interpret results.
Use SHC equation; describe practical steps; evaluate accuracy.
Describe calorimetry-style experiment; apply SHC formula; analyse results.

Student Tips about measuring the specific heat capacity of a liquid

  • Use insulation and a lid to reduce heat loss to surroundings.
  • Stir the liquid gently to ensure uniform temperature.
  • Record temperature at regular intervals for accuracy.
  • Use average voltage and current if calculating power.
  • Repeat and compare with known SHC of water (≈ 4200 J/kg°C).

Common Misconceptions about measuring the specific heat capacity of a liquid

  • Assuming all energy heats the liquid: Some is lost to container and surroundings.
  • Using grams instead of kilograms: Always convert mass to kg.
  • Neglecting heat capacity of container: It may absorb some energy.
  • Confusing SHC with latent heat: SHC involves temperature change, not phase change.

Keywords, phrases and learning objectives for measuring the specific heat capacity of a liquid

Understand how to directly measure the specific heat capacity of a liquid like water or oil. the apparatus method procedure and know how to do the calculation of the specific heat capacity of the liquid under investigation.

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