Curriculum check: ✓ Edexcel IGCSE ✓ OCR GCSE
A solid turning into a liquid
When you heat a solid, it melts and becomes a liquid. Here’s the exact process:
- As the particles in the solid are heated, its temperature increases until it reaches its melting point.
- This “melting point” is the temperature at which there is enough heat energy to break the strong forces of attraction between the particles in a solid.
- It’s important to note that, at this melting point, the kinetic energy of the particles does not increase and so the temperature remains constant.
- The temperature increases as the now liquid state of matter is heated – at which point the heat energy is transferred to the kinetic energy of the particles.
Solidification is the reverse process, it turns a liquid into a solid. As a hot liquid loses heat energy to its surroundings, its temperature falls. and the particles arrange themselves into new “low energy” positions.