This book investigates the fundamental physical principles governing atmospheric phenomena. William Jackson Humphreys, a meteorologist and physicist, draws upon his expertise to present a comprehensive examination of the air's behavior, utilizing established scientific theories and observational data from his era. The work aims to elucidate the complex interactions of temperature, pressure, wind, and other atmospheric variables, providing a foundational understanding for students and researchers.

As a facsimile reprint of a 1920 text, 'Physics of the Air' is valued for its historical significance in the field of meteorology. Its content reflects the scientific understanding of atmospheric science at the turn of the 20th century, offering insights into the foundational theories that preceded modern atmospheric modeling. The book serves as a valuable resource for those studying the history of science or seeking to understand the evolution of meteorological thought. Its enduring relevance lies in its clear exposition of core physical principles that continue to underpin atmospheric studies.