GCSE›AQA GCSE Physics›Mind mapsDensity and States of MatterAQA GCSE Physics: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsDensityMass per unit volumeρ=mV\rho = \frac{m}{V}ρ=VmUnits: kg/m³2 kg in 0.001 m³ gives 2000 kg/m³SolidsParticles closely packedRegular patternParticles vibrate in placeHighest densityLiquidsParticles closely packedRandom arrangementParticles move around each otherMiddle densityDensityand states of matterkgm³ρ\rhoρGasesParticles far apartRandom arrangementParticles move quickly in all directionsLowest densityChanges of stateMelting, freezing, boiling, condensing, sublimingMass is conservedVolume usually changes, so density changesPhysical change: substance can be recoveredExam tipsA change of state is never a chemical changeNo new substance is formedUse kg and m³ in density calculations