The kinetic theory of matter describes the arrangement, motion, and behavior of particles in different states.
Pollen grains suspended in water are observed under a microscope to move with random, zig-zag paths.
State the name of this type of random motion.
Explain how this observed motion provides evidence that water is made of tiny, moving particles.
The table below shows observations of three different states of matter:
| State | Volume | Compressibility |
|---|---|---|
| Solid | Keeps a fixed volume | Extremely difficult to compress |
| Liquid | Keeps a fixed volume | Difficult to compress |
| Gas | Fills any container | Easy to compress |
Explain these observations by describing the arrangement and motion of particles in a solid, a liquid, and a gas.
51 exam-style questions on Edexcel IGCSE Physics Ideal gas molecules. Each one has a worked solution and a mark scheme showing where the marks go.