Latent Heat Practical for O-Level Physics Paper 3
A focused O-Level Physics 6091 Paper 3 guide to latent heat practicals, energy readings, heat loss, mass change, and evaluation language.
The core idea is simple: Latent heat practicals are about energy during a change of state.
Use it as a working check: Watch the mass change, electrical energy input, and heat loss to surroundings.
Then go one layer deeper: In Paper 3, the mark-winning answer is not only a formula. It connects readings, assumptions, heat loss, and the direction of the final error.
The SEAB O-Level Physics 6091 syllabus lists latent heat of substances among possible Paper 3 practical areas. This focused guide sits beside the O-Level Physics Thermal Practical Handbook and the specific heat capacity experiment guide.
Use the O-Level Physics practical hub if you need the wider Paper 3 pathway.
What Makes Latent Heat Different
Specific heat capacity practicals involve a temperature change. Latent heat practicals involve a change of state. During the change of state, the energy supplied changes internal energy without a temperature rise.
That difference affects the practical:
- the mass before and after the change matters;
- the time or electrical energy supplied matters;
- heat loss to surroundings matters a lot;
- the conclusion must mention the change of state, not only "temperature".
What You Usually Measure
The syllabus names the practical area, not one fixed apparatus. Depending on the school setup, a practice question may involve melting, boiling, condensing, cooling curves, or electrical heating.
A typical data chain looks like this:
| Reading | Why it matters |
| Mass before and after | Gives the mass that changed state. |
| Current and voltage | Gives electrical power if an electrical heater is used. |
| Time | Converts power into energy. |
Practical course completion-record note
For practical, lab, and experiment courses, Eclat Institute maintains centre-held attendance records and may also issue an internal attendance or completion document based on participation and internal assessment.
- For SEAB private-candidate declarations, the key evidence is the centre's attendance or completion record, not a government-issued certificate.
- This is an internal centre-issued certificate, not an MOE/SEAB qualification or accreditation.
- Recognition (if any) is determined by the receiving school, institution, or employer.
- For SEAB private candidates taking science practical papers, SEAB states you should either have taken the subject before or attend a practical course and complete it before the practical paper date.
View our sample completion document (Current sample layout (design may be refined over time))
