What is another word for isopiestic lines?
Pronunciation: [a͡ɪsˌə͡ʊpˈɪstɪk lˈa͡ɪnz] (IPA) 
Isopiestic lines are a type of contour line used in thermodynamics to represent lines of constant pressure. There are a few synonyms commonly used to describe these lines including isobaric lines, isochores and isotherms. Isobaric lines are essentially the same as isopiestic lines, but they refer to lines of constant pressure in a specific system, whereas isopiestic lines are used more broadly. Isochores are lines of constant volume, which can be related to isopiestic lines in the sense that a constant volume would likely have a corresponding constant pressure. Finally, isotherms are lines of constant temperature, which can indicate regions of consistent pressure in a thermodynamic system.
