The three states
The three states

A change of state is a physical change in which a substance changes between solid, liquid and gas.
Step-by-step lessons covering AQA GCSE Physics 3.1.2 Changes of state for Foundation and Higher tier. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Build a strong grip on equations, units and Key Stage 3 fundamentals before tackling the more demanding topics like electromagnetism, the particle model of matter and space physics.