Thermodynamics: Thermodynamics is an axiomatic science that deals with the relations among heat, work and properties of system which are in equilibrium. It describes states and changes in the state of physical systems.
System: A thermodynamic system is defined as a quantity of matter or a region in space that is selected for the study.
Surroundings: The mass or region outside the system is called the surroundings.
Boundary: The real or imaginary surfaces that separate the system and surroundings are called the boundary. The real or imaginary surfaces that separate the system and surroundings are called the boundary.
