The world of liquids and gases is an amazing world without forms that surrounds us everywhere. The book by Bulgarian engineer Kuzo P. Bodov tells in a fascinating and accessible form about the various processes and patterns that take place in this world, about how people learn the properties of liquids and gases and use them in their lives and activities. Written in a lively, figurative language, richly illustrated, the book is designed for the widest circle of non-specialist readers. It can be recommended for high school students, students of technical schools.