KERN PBS-A03 Operating Instructions Manual
Also see for PBS-A03: Operating instructions
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Contents
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PBS-A03/A04-BA-e-1213 9ρ = VA-B Lρ+Determining density of liquidsThe density of a fluid is determined with the help of a sinker providing a known volume [ V]. The sinker is weighed in air [ A ] as well as in the test fluid [ B ].According to the Archimedes’ Principle a body immersed in a fluid experiences a force ofbuoyancy. [ G ]. This force equals the weight force of the fluid displaced by the volume ofthe body.The volume [ V ] of the immersed body equals the volume of the displaced fluid.G = buoyancy of sinkerBuoyancy of sinker =Weight of the sinker in air [ A ] - weight sinker in test liquid [ B ]From this follows:ρ = Density of test liquidA = weight of sinker in airB = weight of sinker in sample fluidV = volume of sinker*ρL = Air density (0.0012 g/cm³)* If the volume of the sinker is unknown, this can be determined e.g. in water and becalculated as follows, see chap. 5.1.V = volume of sinkerA = weight of sinker in airB = weight of sinker in waterρW = density of water3.1 Influencing magnitudes and error sources Air pressure temperature Volume deviance of the sinker (± 0,005 cm 3) Surface tension of the liquid Air bubbles Immersion depth of the sample dish of sinker Porosity of the solid |
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