Deep Dive: Why Temperature Stays Constant During State Changes
Part of States of Matter · GCSE GCSE Physics revision
This deep dive covers Deep Dive: Why Temperature Stays Constant During State Changes 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 topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 4 of 13 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 4 of 13
Practice
13 questions
Recall
30 flashcards
🔬 Deep Dive: Why Temperature Stays Constant During State Changes
Imagine particles as prisoners trying to escape. In a solid, they're locked in cells (fixed positions). The energy you add first makes them rattle their bars harder (temperature rises). But to actually ESCAPE, they need extra energy to break the locks (bonds).
During melting, all the energy goes into breaking locks — no energy left over to make them move faster. Once everyone's free (all melted), extra energy makes them run faster (temperature rises again).
The technical explanation:
- Temperature = average KINETIC energy of particles
- During state change, energy increases POTENTIAL energy (bond breaking/forming)
- Kinetic energy stays constant → temperature stays constant
- Once state change complete, kinetic energy can increase again
Keep building this topic
Read this section alongside the surrounding pages in States of Matter. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for States of Matter
In which state of matter are particles arranged in a regular pattern and only vibrate about fixed positions?
Explain what happens to the particles in a solid when it is heated until it melts. Include what happens to the temperature during melting.
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