This edition is the first domestic textbook on the physical essence of baths as special water procedures for various purposes. The main goal of this textbook is the revival of mass, primarily professional interest in baths, but not in terms of history and customs, but in terms of a promising essence. Let's find out why, why and how the very famous bath conditions are created in the baths, under which you can wash so comfortably, and be treated, and communicate, and relax. We will understand why people are steaming and why they sweat differently depending on the features of the bath. This book is for the townspeople, and the attitude of the townspeople to the baths is far from unambiguous. There are fans who are convinced that life is unthinkable without baths, that for Russians, they say, a bath is "sacred dogma, national pride and vitality." There are amateurs who treat the bath more restrainedly as a pleasant prestigious holiday, respect the bath for strong steam, a scalding broom and a friendly feast. There are also those (and most) who are absolutely indifferent to any baths, considering them a dense anachronism, miraculously preserved in the age of ultra-modern baths and showers, swimming pools and water parks.