The condition of a system as descriked by its properties A macroscopic characteristic of a system to which a numerical value can be assigned at a given time without knowledge of the previous behavior A property whose value is independent of the size or extent of a system and may vary from place to place within the system at any moment A region of space through which mass may flow Distinguishes the system from its surroundings Whatever is studied A transformation from one state to another A fixed quantity of matter A property whose value for an overall system is the sum of its values for the parts into which the system is divided Solution 1. Boundary: Distinguishes the system from its surroundings 2.Closed system: A macroscopic characteristic of a system to which a numerical value can be assigned at a given time without knowledge of the previous behavior. 3. Control Volume: A region of space through which mass may flow 4.Extensive property: A property whose value for an overall system is the sum of its values for the parts into which the system is divided. 5. Intensive property: A property whose value is independent of size and extent of a system and may vary from place to place within the system at any moment. 6. Process: A transformation from one state to other 7.property: whatever is studied 8. State: the condition of a system as described by its properties 9.Surroundings: everything external to the system 10. System: A fixed quantity of matter .