GCSE›Edexcel GCSE Physics›Mind mapsParticle Model & PressureEdexcel GCSE Physics: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsCauseParticles collide with container wallsEach collision gives a tiny forceNet force acts at right angles to the surfaceTemperatureHigher temperature → faster particlesAt constant volume, collisions more frequentCollisions also harderSo pressure risesKelvin scaleAbsolute zero is −273 °CMinimum possible kinetic energyT(K)=T(∘C)+273T(\text{K}) = T(^\circ\text{C}) + 273T(K)=T(∘C)+27320 °C = 293 KGas pressureparticle modelPVKVolumeSmaller volume at constant temperatureParticles hit walls more oftenPressure risesP1V1=P2V2P_1V_1 = P_2V_2P1V1=P2V2Work on gasCompressing transfers energy to particlesKinetic energy and temperature riseBicycle pump feels warmExam tipsGive both reasons: more frequent AND harder collisionsConvert to kelvin before using gas ideas