Introduction

Vacuum bubbling, which means creating bubbles under vacuum, is the counterpart to evaporation by heating. Heated evaporation occurs both on the surface and in the liquid, but in vacuum bubbling, the evaporation process mainly appears in the form of bubbles in the liquid. In this book, vacuum bubbling is introduced as another method that can be considered for efficient use of energy among technological fields based on high temperature and high pressure, which have been standardized along with mass production during the industrialization process. Henry’s law regarding solubility and the principle of bubble generation under phase change conditions operate on the same principle regardless of whether the temperature is high or low. In this book, two characteristics of bubbles created in vacuum conditions, namely, supersaturated solute gas and vapor bubbles, and the principle of their creation are explained. In particular, the generation of room-temperature vapor bubbles, the understanding of their properties, and their possible uses are discussed, which have not been studied much so far.