Determining Filling Volumes based on Density Measurement
Whereas some products are quantified by their weight, for example some pre-packed goods in Europe, others are filled, paid and even taxed by their volume. Frequently, it is easier to measure the weight of a fluid product with a balance, followed by calculating the filling volume by using the density of the sample. This procedure is well proven and straightforward and therefore frequently applied wherever the measurement of volumes is not possible.
Does “Density” always mean the same?
A few considerations
The density of liquids and gases is highly temperature- dependent. As a consequence, precise density measurements either have to be temperature-controlled or they require an accurate temperature measurement. The true density of liquids and gases in Anton Paar density meters is measured with the oscillating U-tube method.
The oscillating U-tube method
The sample is introduced into a U-shaped borosilicate glass tube that is being excited to vibrate at its characteristic frequency electronically. The characteristic frequency changes depending on the density of the sample. Through determination of the characteristic frequency, the density of the sample can be calculated.
Due to the temperature dependency of the density value, the temperature of the sample has to be determined precisely.
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