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GCSE Physics · key term
A physical change between solid, liquid and gas states.
Used by AQA, Edexcel and OCR
Specification 4.3.1.2 · Paper 1
A physical change in which a substance changes between the solid, liquid and gas states without becoming a different substance.
Revise: Changes of stateA change of state moves the substance from one of these physical states to another. It does not turn the substance into a new substance: ice, liquid water and water vapour are all made of water molecules.
Specification 14.6, 14.9 · Paper 2
A physical transition between solid, liquid and gas, such as melting or boiling.
Revise: Heating a SystemWhich effect occurs depends on the substance’s state and whether it has reached a temperature at which a change of state takes place.
Specification P1.2a, P1.2c · Paper 1 (Foundation), Paper 3 (Higher)
A physical change between solid, liquid and gas, such as melting, freezing, evaporation, condensation or sublimation.
A physical transition between solid, liquid and gas in which no new substance is formed.
Paper 1, Paper 2
A physical change between solid, liquid and gas in which the substance remains the same substance.
Revise: Heating, Energy Storage and Changes of StateThe additional internal energy may raise its temperature, produce a change of state, or contribute to both at different stages of the heating process.
Do not describe every reversible change as a change of state: dissolving can also be reversible, but it is not melting.
Distinguish energy from temperature: a system can gain energy during a change of state while its temperature remains constant.
If asked what heating does, include both possible outcomes: it may raise the temperature or produce a change of state.
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