Thermodynamic square

The thermodynamic square, also known as the thermodynamic box or thermodynamic quadrilateral, is a useful graphical representation in thermodynamics that helps illustrate relationships among various thermodynamic properties such as pressure, volume, temperature, and internal energy. It provides a visual way to understand changes and relationships between these properties in different thermodynamic processes. The basic concept involves a square (or quadrilateral) where each vertex represents a specific state or property. The sides represent relationships between these properties.