"Version: 20250701"--Title page verso.Includes bibliographical references.1. Introduction -- 1.1. Definition -- 1.2. Sensitivity -- 1.3. Selectivity -- 1.4. Stability2. Properties of gases -- 2.1. Microscopic properties -- 2.2. Macroscopic properties -- 2.3. Transport properties3. Direct transducers for gas sensing -- 3.1. Thermal conductivity detectors -- 3.2. Paramagnetic sensors -- 3.3. Pell…