GCSE›Edexcel GCSE Physics›Mind mapsPressure & Pressure Differences in FluidsEdexcel GCSE Physics: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsPressureP=FAP = \frac{F}{A}P=AFUnit is pascal (Pa) or N/m²Force acts normal to the surfaceSmaller area → larger pressureEveryday useSharp knife cuts easily: small areaSnowshoes stop sinking: large areaIn fluidsPressure passes equally in all directionsApplies to liquids and gasesEnclosed fluid feels the pressure everywhereFluid pressureforce on an areaPaNm²HydraulicsSmall force on small pistonSame pressure on large pistonOutput force is multipliedCar brakes use brake fluidDepthPressure rises with depthMore liquid weight aboveΔP=hρg\Delta P = h\rho gΔP=hρgNot affected by container shapeExam tipsUse only the normal component of forceDepth in m, density in kg/m³