# Topic Questions: 125 be able to use the equations $\Delta E=mc\Delta\theta$ and $\Delta E=L\Delta m$ — WPH15 Thermodynamics > 44 WPH15 Thermodynamics topic questions (145 marks) on 125 be able to use the equations … and … — 20 papers, 2020–2026. Open the exact question in the… - Canonical HTML: https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/125-be-able-to-use-the-equations-delta-e-mc-delta-theta-and-delta-e-l-delta-m/ - Markdown mirror: https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/125-be-able-to-use-the-equations-delta-e-mc-delta-theta-and-delta-e-l-delta-m/index.md --- Edexcel IAL · Physics · WPH15 · Thermodynamics 44 WPH15 Thermodynamics topic questions are tagged to this syllabus point across 20 papers (2020–2026). Only the parts whose knowledge graph matches this syllabus statement are counted, and the table shows which parts of each question are involved. - 44 topic questions - 20 papers - 145 tagged marks - 39.6% of topic questions - 43.0% of topic marks - 2020–2026 - Syllabus 2018–current - [All WPH15 Thermodynamics topic questions](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/) - [All paper codes](https://www.examsci.com/topics/) Core finding **This Thermodynamics syllabus point appears in 20 WPH15 papers across 2020–2026, contributing 44 topic questions and 145 marks.** The most recent appearance is WPH15/01 January 2026. That equals 39.6% of the 111 topic questions and 43.0% of the 337 marks tagged to Thermodynamics. Only parts tagged to this subtopic are counted, so a four-part question can contribute one item and one part's marks. The table lists every matching question, its tagged parts and marks, with a link back to the paper page. Sessions are newest first, so the statement can be traced back through the full paper history. ## Topic questions by session Newest sessions first. Parts and marks count only the parts tagged to this subtopic; “x of y parts” shows how much of the question is tagged elsewhere. Select the paper cell to open the matching question on the paper page, or use **Go to Practice Hub** to answer that exact question in the Interactive Practice Hub. | Paper | Question | Type | Parts | Marks | Difficulty | Practice | | --- | --- | --- | --- | --- | --- | --- | | [**WPH15/01** January 2026 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2026-january-wph15-01/#q-12) | **Q12** Acid-Alkali Mixture Heat Calculation - Edexcel IAL Physics Jan 2026 Q12 | FRQ | 1 part | 2 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=33df4133-3f97-49c4-8770-848b232eb7b1&question_id=6d4f36de-1ec5-4c4a-8e37-b7f0faa98c7d&source_detail=WPH15%2F01+January+2026) | | [**WPH15/01** January 2026 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2026-january-wph15-01/#q-16) | **Q16** Historical Salt Evaporation Accuracy Evaluation - Edexcel IAL Physics Jan 2026 Q16 | FRQ | 1 part | 6 | Hard | [Go to Practice Hub](https://www.examsci.com/practice?set_id=33df4133-3f97-49c4-8770-848b232eb7b1&question_id=01e24b2f-3d06-44cc-bff6-0a98f97475df&source_detail=WPH15%2F01+January+2026) | | [**WPH15/02** January 2026 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2026-january-wph15-02/#q-14) | **Q14** Specific Heat and Latent Heat Calculation - Edexcel IAL Physics Jan 2026 Q14 | FRQ | 1 part | 5 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f63db731-6514-40da-90c9-5232288471cb&question_id=27523d37-39e9-462c-9187-4c4785c9c538&source_detail=WPH15%2F02+January+2026) | | [**WPH15/02** January 2026 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2026-january-wph15-02/#q-17) | **Q17** Dispenser Water Chiller Calculation - Edexcel IAL Physics Jan 2026 Q17 | FRQ | 2 parts ((a), (b)) | 5 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f63db731-6514-40da-90c9-5232288471cb&question_id=3ed6afa4-4aec-4b2b-8bac-f42d9126f775&source_detail=WPH15%2F02+January+2026) | | [**WPH15/01** October 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-october-wph15-01/#q-16) | **Q16** Thermodynamics - Cooling Mugs - Edexcel IAL Physics Oct 2025 Q16 | FRQ | 2 parts ((a), (b)) | 6 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a7fbae2d-76be-4ac0-9bd4-df3ed119c92f&question_id=a1aaac48-ae61-4625-bcf3-8639b229c4cd&source_detail=WPH15%2F01+October+2025) | | [**WPH15/02** October 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-october-wph15-02/#q-16) | **Q16** Thermodynamics of Mug Cooling - Edexcel IAL Physics Oct 2025 Q16 | FRQ | 2 parts ((a), (b)) | 6 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=e7442241-a09d-4872-a697-6e37dca804e8&question_id=34c2dc01-8616-4c7a-8136-e517ab595fab&source_detail=WPH15%2F02+October+2025) | | [**WPH15/01** June 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-june-wph15-01/#q-16) | **Q16** Thermodynamics of Ice Block - Edexcel IAL Physics June 2025 Q16 | FRQ | 2 parts ((a), (b)) | 7 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=2e30fb2a-dfff-4c32-b30f-fefebd92c451&question_id=c3ab09bc-c1d5-40fc-8abc-67410bd8911c&source_detail=WPH15%2F01+June+2025) | | [**WPH15/01** January 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-january-wph15-01/#q-10) | **Q10** Heating Curve and Specific Heat Capacity - Edexcel IAL Physics Jan 2025 Q10 | MCQ | MCQ · 1 part | 1 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=40c335c3-e98a-43c8-b5d1-d1abedfaca1a&question_id=19ed4d37-6963-4d90-8fb8-c14b824328da&source_detail=WPH15%2F01+January+2025) | | [**WPH15/01** January 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-january-wph15-01/#q-13) | **Q13** Heating and Efficiency of Boiling Water - Edexcel IAL Physics Jan 2025 Q13 | FRQ | 2 parts ((a), (b)) | 6 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=40c335c3-e98a-43c8-b5d1-d1abedfaca1a&question_id=b322b843-054a-48b9-8247-68ab37bc170e&source_detail=WPH15%2F01+January+2025) | | [**WPH15/01** January 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2025-january-wph15-01/#q-20) | **Q20** Instant Boiling Water System - Edexcel IAL Physics Jan 2025 Q20 | FRQ | 2 parts ((a), (b)) | 10 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=40c335c3-e98a-43c8-b5d1-d1abedfaca1a&question_id=79c37eca-b258-4a3a-a0db-078069cf2a63&source_detail=WPH15%2F01+January+2025) | | [**WPH15/01** October 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2024-october-wph15-01/#q-12) | **Q12** Edexcel IAL Physics Unit 5 Oct 2024 Q12 | FRQ | 1 part | 4 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=3e10632c-bdcc-44a6-afc4-5f4f7a30978e&question_id=421c3d4c-7cb6-44a2-9a2a-ae51fc09e57d&source_detail=WPH15%2F01+October+2024) | | [**WPH15/01** June 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2024-june-wph15-01/#q-15) | **Q15** Melting Ice Floe - Edexcel IAL Physics Unit 5 Jun 2024 Q15 | FRQ | 2 parts ((a), (b)) | 9 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=fd4de767-0a74-4fd7-9f81-6fb7daf58d01&question_id=61459150-52a3-41df-b3e9-1f581f17f1b1&source_detail=WPH15%2F01+June+2024) | | [**WPH15/01** January 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2024-january-wph15-01/#q-15) | **Q15** Thermodynamics - Edexcel IAL Physics Jan 2024 Q15 | FRQ | 2 parts ((a), (b)) | 5 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=81ae8d95-9845-43d2-85aa-56edeba0f606&question_id=4602b95a-2a13-45d3-af6d-6b922593bf44&source_detail=WPH15%2F01+January+2024) | | [**WPH15/01** October 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2023-october-wph15-01/#q-16) | **Q16** Thermal Calculations for a Kettle - Edexcel IAL Physics Oct 2023 Q16 | FRQ | 2 parts ((a), (b)) | 7 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c6d9493b-ab37-4b2a-967c-30f17fd52e71&question_id=23040de0-2906-46fd-856d-5e2ce5b8a3a0&source_detail=WPH15%2F01+October+2023) | | [**WPH15/01** October 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2023-october-wph15-01/#q-18) | **Q18** Gravitational Calculations for Asteroid 2023 BU - Edexcel IAL Physics Oct 2023 Q18 | FRQ | 1 of 3 parts ((c)) | 2 of 9 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c6d9493b-ab37-4b2a-967c-30f17fd52e71&question_id=6bd3e6d1-5c77-4e6f-a397-bf0dfb2fcc8f&source_detail=WPH15%2F01+October+2023) | | [**WPH15/01** June 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2023-june-wph15-01/#q-14) | **Q14** Edexcel IAL Physics Unit 5 June 2023 Q14 | FRQ | 2 parts ((a), (b)) | 7 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=25ca8d3d-f529-419a-8ab4-22f4c43251b4&question_id=5149264c-4521-40eb-a915-6642fd2c334c&source_detail=WPH15%2F01+June+2023) | | [**WPH15/01** January 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2023-january-wph15-01/#q-4) | **Q4** Specific Latent Heat of Wax - Edexcel IAL Physics Jan 2023 Q4 | MCQ | MCQ · 1 part | 1 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=79fd249d-5274-48b7-a2fe-e660c6fd21a0&question_id=b48bb957-8357-43ac-a580-dea8915c1190&source_detail=WPH15%2F01+January+2023) | | [**WPH15/01** January 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2023-january-wph15-01/#q-11) | **Q11** Swimming Pool Heating Calculation - Edexcel IAL Physics Jan 2023 Q11 | FRQ | 2 parts ((a), (b)) | 4 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=79fd249d-5274-48b7-a2fe-e660c6fd21a0&question_id=1cb69e1a-6803-473d-b44f-a2a6547a7f95&source_detail=WPH15%2F01+January+2023) | | [**WPH15/01** October 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2022-october-wph15-01/#q-11) | **Q11** Shower and Bath Energy Calculation - Edexcel IAL Physics Oct 2022 Q11 | FRQ | 1 part | 5 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=11a7a1e1-92c0-4c27-923f-84fabaf236e5&question_id=7197695b-d80d-4a02-89a6-9ef36ca4d67e&source_detail=WPH15%2F01+October+2022) | | [**WPH15/01** June 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2022-june-wph15-01/#q-20) | **Q20** Lead Shot Manufacture and Specific Heat Capacity - Edexcel IAL Physics Jun 2022 Q20 | FRQ | 4 parts ((a)(i), (a)(ii), (b)(i), (b)(ii)) | 12 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=9a093fb4-7c1b-4987-9e36-33b3e20c2b25&question_id=2f2a430d-073b-4150-bb78-0bda948bb664&source_detail=WPH15%2F01+June+2022) | | [**WPH15/01** January 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2022-january-wph15-01/#q-12) | **Q12** Specific Latent Heat and Calorimetry - Edexcel IAL Physics Jan 2022 Q12 | FRQ | 1 part | 5 | Hard | [Go to Practice Hub](https://www.examsci.com/practice?set_id=ba0935d7-8bd2-4880-a14a-07ef68b24285&question_id=80d229c0-9d3b-4fe2-90ad-16205ab32262&source_detail=WPH15%2F01+January+2022) | | [**WPH15/02** January 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2022-january-wph15-02/#q-15) | **Q15** Thermodynamics of Hammering Steel - Edexcel IAL Physics Jan 2022 Q15 | FRQ | 2 parts ((a), (b)) | 6 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=23304130-a638-4c40-b130-1921931842df&question_id=f3874b63-dd6e-47b9-85e7-d0d6ae1fe2fc&source_detail=WPH15%2F02+January+2022) | | [**WPH15/01** October 2021 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2021-october-wph15-01/#q-12) | **Q12** Kettle Water Vaporisation - Edexcel IAL Physics Oct 2021 Unit 5 Q12 | FRQ | 1 part | 4 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=85f00adf-61bf-4290-b7e1-556838a91d6f&question_id=d243ec77-305a-4099-8b6e-2e8817cf428a&source_detail=WPH15%2F01+October+2021) | | [**WPH15/01** June 2021 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2021-june-wph15-01/#q-13) | **Q13** Melting of Chocolate Palace - Edexcel IAL Physics Jun 2021 Q13 | FRQ | 1 part | 6 | Hard | [Go to Practice Hub](https://www.examsci.com/practice?set_id=ab093dfb-339d-4a8a-9997-6d539dfdc6b8&question_id=f19cbb8a-dd39-4931-b8a4-761a21080b04&source_detail=WPH15%2F01+June+2021) | | [**WPH15/01** January 2021 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2021-january-wph15-01/#q-12) | **Q12** Thermodynamics - boiling water with portable heater | FRQ | 2 parts ((a), (b)) | 6 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=2e0b1233-9e48-4222-bc71-6c120258396f&question_id=64af589d-a7ab-40d8-8adb-bde677989442&source_detail=WPH15%2F01+January+2021) | | [**WPH15/01** January 2021 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2021-january-wph15-01/#q-13) | **Q13** SI Units and Simple Pendulum - seconds pendulum | FRQ | 1 of 3 parts ((a)) | 1 of 4 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=2e0b1233-9e48-4222-bc71-6c120258396f&question_id=edc21474-376d-4555-8731-a56a2305cef8&source_detail=WPH15%2F01+January+2021) | | [**WPH15/01** October 2020 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/physics/physics-unit-5-wph15/2020-october-wph15-01/#q-19) | **Q19** Microwave Cooking and Thermal Physics - Edexcel IAL Physics Oct 2020 Q19 | FRQ | 2 of 5 parts ((c)(i), (c)(ii)) | 7 of 14 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=1a3931f7-4a72-41eb-af5a-0d315b2148a6&question_id=8ae7a889-a90b-4d31-b0a0-876265323efc&source_detail=WPH15%2F01+October+2020) | ## Related topic questions in Thermodynamics - [126 CORE PRACTICAL 12: Calibrate a thermistor in a potential divider circuit as a thermostat](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/126-core-practical-12-calibrate-a-thermistor-in-a-potential-divider-circuit-as-a/) — 3 question items · 3 papers — 13 marks · 2020–2024 - [127 CORE PRACTICAL 13: Determine the specific latent heat of a phase change](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/127-core-practical-13-determine-the-specific-latent-heat-of-a-phase-change/) — 3 question items · 3 papers — 6 marks · 2020–2026 - [128 understand the concept of internal energy as the random distribution of potential and kinetic energy amongst molecules](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/128-understand-the-concept-of-internal-energy-as-the-random-distribution-of-potential/) — 16 question items · 9 papers — 48 marks · 2020–2026 - [129 understand the concept of absolute zero and how the average kinetic energy of molecules is related to the absolute temperature](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/129-understand-the-concept-of-absolute-zero-and-how-the-average-kinetic-energy-of/) — 11 question items · 10 papers — 40 marks · 2020–2026 - [130 be able to use the equation $pV=NkT$ for an ideal gas](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/130-be-able-to-use-the-equation-pv-nkt-for-an-ideal-gas/) — 32 question items · 20 papers — 101 marks · 2020–2026 - [131 CORE PRACTICAL 14: Investigate the relationship between pressure and volume of a gas at fixed temperature](https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/131-core-practical-14-investigate-the-relationship-between-pressure-and-volume-of-a/) — 1 question items · 1 papers — 4 marks · 2023 ## Topic question rules and edge cases **How many topic questions cover this syllabus point?** 27 question stems cover this subtopic across 20 papers, but only 44 tagged parts and 145 marks belong to it. Other parts of the same questions are assessed under different statements and are excluded from this page. **Which papers include this subtopic?** The table lists every matching session from 2020–2026. Each row links to the question anchor on the paper page, where the full paper context and practice entry point are available. **Why can one question appear under several subtopics?** The parts of one question can assess different syllabus statements. Each part is counted under its own subtopics, so the same question stem can appear on several subtopic pages while each page lists only the parts and marks tagged to that statement. **Can I practise these questions with AI marking?** Yes. Open a paper from the table and use the Interactive Practice Hub entry point. The page itself is static HTML so search engines and retrieval agents can read the full question list without executing JavaScript. --- Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/topics/edexcel-ial/physics/physics-unit-5-wph15/thermodynamics/125-be-able-to-use-the-equations-delta-e-mc-delta-theta-and-delta-e-l-delta-m/