How Internal Energy Changes During Heating
Part of States of Matter — GCSE Physics
This how it works covers How Internal Energy Changes During Heating within States of Matter for GCSE Physics. Revise States of Matter in Particle Model for GCSE Physics with 13 exam-style questions and 30 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 7 of 13 in this topic. Use this how it works to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 7 of 13
Practice
13 questions
Recall
30 flashcards
⚙️ How Internal Energy Changes During Heating
The internal energy of a substance is the total kinetic and potential energy of all its particles.
- Heating a solid below its melting point: Kinetic energy increases → particles vibrate more → temperature rises.
- At the melting point: Energy goes into potential energy (breaking bonds) → kinetic energy constant → temperature constant.
- Heating the liquid: Kinetic energy increases again → temperature rises.
- At the boiling point: Energy goes into potential energy (completely separating particles) → temperature stays constant.
- Heating the gas: Kinetic energy increases → temperature rises.
So internal energy increases throughout — but whether that increase shows as higher temperature depends on whether particles are changing state or just moving faster.