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  • The oscillating U-tube is a technique to determine the density of liquids and gases based on an electronic measurement of the frequency of oscillation, from which the density value is calculated. This measuring principle is based on the Mass-Spring Model. The sample is filled into a container with oscillation capacity. The eigenfrequency of this container is influenced by the sample’s mass. This container with oscillation capacity is a hollow, U-shaped glass tube which is electronically excited into undamped oscillation. The two branches of the U-shaped oscillator function as its spring elements. The direction of oscillation is normal to the level of the two branches. The oscillator’s eigenfrequency is only influenced by the part of the sample that is actually involved in the oscillation. The volume involved in the oscillation is limited by the stationary oscillation knots at the bearing points of the oscillator. If the oscillator is at least filled up to its bearing points, the same precisely defined volume always participates in the oscillation, thus the measured value of the sample’s mass can be used to calculate its density.