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The original wort
With the beer spindle, also called density spindle or hydrometer, the density, i.e. the mass per unit volume of the beer, can be determined. The measurement is based on Archimedes' principle, according to which a body is immersed in a liquid until its weight corresponds to the displaced liquid. The greater the density of the liquid, the greater the buoyancy and the less deeply the spindle plunges into the liquid. The density of any liquid depends on its temperature. The higher the temperature the lower the density. Spindles are always calibrated to a temperature of around 20 ° C.
The pycnometer determines the density of solids or liquids by weighing. It consists of a glass flask with a special ground-glass stopper that has a thin passage and contains the capillary there. The filling volume can thus be precisely adjusted. Essentially, the pycnometer is used to provide a precisely reducible volume of liquids. After weighing the empty and filled pycnometer, the density of the filling can be calculated.
The flexural oscillator can be used to determine the density of gases and liquids. The density is calculated from the natural frequency of a flexural oscillator filled with the medium to be examined. The principle of measurement is based on a spring-mass oscillator, the mass of which is partly formed by the medium to be measured.
The refractometer is a measuring device for determining the refractive index of - liquid or solid - transparent substances by refractometry. It uses the behavior of light at the transition between a prism with known properties and the substance to be tested. If the general composition of a liquid is known, a refractometer can be used to measure the concentration of dissolved substances in it. This is how the sugar content of the plants is determined in connection with the harvest of wine or sugar beet. In ophthalmology, a refractometer is used to determine the refractive ratios of the eyes.
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