Work (thermodynamics) of the energy went out as heat, and how much as work. This can be summarized by saying that heat and work are not state functions of the system. This is in contrast to classical mechanics, where net work exerted by a particle is a state function. Pressure–volume work (or "PV" work) occurs when the volume of a system changes. "PV" work is often measured in units of litre-atmospheres where = . However, the litre-atmosphere is not a recognised unit in the SI system of units, which measures P in Pascal (Pa), V in m, and PV in Joule (J),
Insanity in Ancient and Modern Life which his work was received. His books, including the Insanity in Ancient and Modern life, are often cited and referred to in scientific literature about sociocultural causes and influential factors contributing to insanity in the past and present. Additionally, he is often minorly mentioned in historical books about the emergence of psychology as a discipline. Tuke was among the first persons to recognize an increase in the prevalence of insanity by making use of statistics to identify possible causes, which he clarifies in great detail in "Insanity in Ancient and Modern Life." As many of his other books, the book