This book provides a comprehensive study of the density and thermal expansion of American petroleum oils. The author examines the relationship between these properties and the temperature of the oil, offering valuable insights for professionals in the petroleum industry. Through meticulous experiments and analysis, the author presents detailed data on the density and thermal expansion of various petroleum samples. These findings serve as the foundation for the development of standard density and volumetric tables, which are essential for accurate measurements and calculations in the oil industry. The book delves into the factors influencing the rate of expansion in petroleum oils, including the presence of dissolved substances. It highlights the significance of understanding these factors for the proper handling and storage of petroleum products. This book is a valuable resource for scientists, engineers, and technicians involved in the exploration, production, and refining of petroleum. Its comprehensive data and insights contribute to the advancement of knowledge in the field and provide practical guidance for optimizing oil industry operations.