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solids liquids & gas
key definitions
| Term | Definition |
|---|---|
| matter | anything that occupies space and has mass |
| solids | state of matter with a regular shape, fixed mass and fixed volume |
| liquids | state of matter with irregular shape, fixed mass and fixed volume |
| gas | state of matter with no regular shape, fixed mass but no fixed volume |
| diffusion | spreading of particles to fill available space |
| melting | changing of a solid to a liquid when heat is added |
| evaporating | changing of a liquid to a gas when heat is added |
| condensing | changing of a gas to a liquid when heat is taken away |
| freezing | changing of a liquid to a solid when heat is taken away |
| boiling | when evaporation is occurring throughout a liquid |
| boiling point | temperature at which evaporation occurs throughout a liquid |