| Question | Answer |
| What does thermodynamics mean? | The word thermodynamics is derived from two Greek words: Thermes - Heat Dynamikos - Energy |
| What is the first law of thermodynamics? | The conservation of energy. "the total amount of energy is a system must remain constant, energy cannot be creates or destroyed but it can be transformed from one form to another" |
| Definition of a closed system or "control mass" | A closed system is a system in which only energy can cross the system boundary in the form of heat or work. No mass can cross the system boundary. |
| Definition of an open system or "control volume" | An open system is a system in which energy can cross the system boundary in the form of heat and work. Mass can also cross over the system boundary. |
| Definition of an isolated system | An isolated system is a system in which neither mass nor energy can cross over the systems boundary. |
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