Formation of air bubbles in air-saturated water at reduced pressure and their indication by an acoustical measuring procedure

With the aid of sound-absorption measurements the formation of bubbles in water saturated with air is investigated. The bubbles occur when the static air pressure in the sample holder is reduced gradually or in steps. The formation of bubbles is reduced when the water is subjected to a pressure greater than atmospheric before commencing the experiment.

The behaviour of air pockets adhering to solids and of air-filled pores in the walls of the container or in solid particles under conditions of increased or of decreased pressure is considered. Calculations of the growth and ascent of bubbles and the sound absorption caused thereby are compared with measurements.