A reversible change changes how a material looks, but it's still the same substance — and you can get the original back.
| Change | What happens | Temperature (water) |
|---|---|---|
| Melting | solid → liquid | 0°C |
| Freezing | liquid → solid | 0°C |
| Boiling / evaporating | liquid → gas | 100°C |
| Condensing | gas → liquid | 100°C |