KERN ABT-A01 Operating Manual

Contents

Determining density of liquids:The density of a fluid is determined with the help of a plummet providing a knownvolume [ V ]. The plummet is weighed in air [ A ] as well as in the sample fluid [ B ].According to the Archimedes’ Principle a body immersed in a fluid experiences aforce of buoyancy [ G ]. This force equals the weight force of the fluid displaced bythe volume of the body.The volume [ V ] of the immersed body equals the volume of the displaced fluid.ρ = GVG = buoyancy of plummetBuoyancy of plummet =Weight of the sinker in air [ A ] - weight sinker in sample liquid [ B ]From this follows:ρ = VA-B Lρ+ρ = density of sample fluidA = weight of plummet in airB = weight of plummet in sample fluidV = volume of plummetρL = air density (0.0012 g/cm³)3.1 Influencing magnitudes and error sourcesÖ Air pressureÖ TemperatureÖ Volume deviance of the sinker (± 0.005 cm3)Ö Surface tension of the liquidÖ Air bubblesÖ Immersion depth of the sample dish of sinkerÖ Porosity of the solid30 ABT-A01-BA-defsi-0710