Unit 3: Matter- Syllabus topics 9, 10 & 27

9. Phases of matter
   9.1 Density
   9.2 Solids, liquids, gases
   9.3 Pressure in fluids
   9.4 Change in phase

10. Deformation of solids
   10.1 Stress, strain
   10.2 Elastic & plastic behaviour