Chapter 3 · Theory of the Measurement Methods and Quantities Considered
Original mathematical expression or figure
Figure 3.1: Model of an ideal liquid with voids between individual molecular representatives (spheres), together with schematic representations of shear viscosity and bulk viscosity using the same model.

According to Kirchhoff [24], the following relationship holds:

Original mathematical expression or figure

Here, cp denotes the specific heat capacity at constant pressure, cv the specific heat capacity at constant volume, and X the thermal conductivity coefficient.

Other causes of sound absorption in liquids include all phenomena that can be classified as inhomogeneities of the liquid and at which the sound wave can lose energy, such as suspensions or air bubbles.

Original formula typography retained. .