AllChemicals — The Online Chemical Glossary | https://allchemicals.info/chemical/671-physical-change
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Quick Reference
Also Known As
Physical transformation, state change, physical process
What is Physical Change?
A change that alters the form or physical properties of a substance without changing its chemical composition. Examples include melting, boiling, dissolving, and crushing. Physical changes are generally reversible and do not break or form chemical bonds.
Properties & Characteristics
A physical change alters a substance's physical form or appearance without changing its chemical composition or molecular identity. Examples: melting ice (H₂O solid → liquid), dissolving sugar (dispersion without reaction), cutting paper, boiling water, bending wire. The original substance can be recovered by physical means. Physical changes involve overcoming intermolecular forces but not breaking intramolecular (covalent) bonds.
Uses & Applications
Distinguishing physical from chemical changes is fundamental to chemistry education and to laboratory separations: distillation, crystallisation, filtration, and evaporation are all physical separation methods that exploit physical changes (phase transitions, solubility differences) without altering the chemical substance.
Safety Information
Physical changes can still create hazards: melting a solid may form a reactive molten material; dissolving certain solids is exothermic (enthalpy of solution); boiling liquids produce hot vapours. The absence of a chemical reaction does not mean a physical change is safe.
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
SynonymsPhysical transformation, state change, physical process
Frequently Asked Questions
A change that alters the form or physical properties of a substance without changing its chemical composition. Examples include melting, boiling, dissolving, and crushing. Physical changes are generally reversible and do not break or form chemical bonds.
Distinguishing physical from chemical changes is fundamental to chemistry education and to laboratory separations: distillation, crystallisation, filtration, and evaporation are all physical separation methods that exploit physical changes (phase transitions, solubility differences) without altering…
Physical changes can still create hazards: melting a solid may form a reactive molten material; dissolving certain solids is exothermic (enthalpy of solution); boiling liquids produce hot vapours. The absence of a chemical reaction does not mean a physical change is safe.
Editorial standards: Chemical data is sourced from peer-reviewed literature,
CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA,
and IAEA. For educational purposes only — always consult official SDS documentation and qualified
professionals before handling chemicals.
