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An aerometer is a scientific instrument used to measure the weight and density of a gas or liquid. In essence it is a hollow tube widened at one end, the bottom. At the bottom a weight is placed (B). On the upper part of the rod a scale is present. The aerometer is placed in the liquid to test. By the weight in the lower part the scale (A) will be uprighted. The scale, and thus the density of the liquid, is read at the point at which the scale penetrates the surface of the liquid. Captain Nemo and Professor Aronnax contemplating measuring instruments in Twenty Thousand Leagues Under the Sea In physics and engineering, measurement is the activity of comparing physical quantities of real-world objects and events. ... For other uses, see Weight (disambiguation). ... For other uses, see Density (disambiguation). ... For other uses, see Gas (disambiguation). ... For other uses, see Liquid (disambiguation). ...

Scope of use

As the density of a liquid is only partly determined by the density of the solvent, different solutes may add or substract to that value, the arometer is of no use in determing the nature of an unknown liquid. On the other side, in a well known situation - the origin of the sample is known and wel defined, this simple apparatus can monitor a proces or estimate a concentration. For example, after distillation on can determine the alcohol contents of beverages by use of the aerometer. For other uses, see Solvent (disambiguation). ... Laboratory distillation set-up: 1: Heat source 2: Still pot 3: Still head 4: Thermometer/Boiling point temperature 5: Condenser 6: Cooling water in 7: Cooling water out 8: Distillate/receiving flask 9: Vacuum/gas inlet 10: Still receiver 11: Heat control 12: Stirrer speed control 13: Stirrer/heat plate...

Principle

The aerometer is a direct use of the law of Archimedes: the upward force by a liquid equals then mass of the displaced liquid. The weight of the aerometer is fixed, the deeper the meter sinks in the liquid the more of it is replaced. Eventualy equilibrium is reached, the aerometer floats. For other uses, see Archimedes (disambiguation). ...