2013-2-27 Application areas of Thermodynamics Defining Systems System:whatever we want to study (Quantity of mass or region in space) Surroundings:everything external to the system. Boundary:separates system from its surroundings.Can be fixed or movable. Surroundings Boundary Surroundings Surroundings System Surroundings 1-30 15 2013-2-27 15 Application areas of Thermodynamics 1-29 Defining Systems ►System: whatever we want to study; (Quantity of mass or region in space) ►Surroundings: everything external to the system. ►Boundary: separates system from its surroundings. Can be fixed or movable. System Boundary 1-30 Surroundings Surroundings Surroundings Surroundings