Thermodynamics: Thermodynamic systems, properties and states — Systems, Properties and Equilibrium
How engineers draw a system's boundary, classify its properties and decide when its state is well defined.
Thermodynamics · 24 questions
Try 3 questions
1. What defines a closed system in thermodynamics?
- Neither mass nor energy can cross
- Mass cannot cross the boundary, energy can
- Both mass and energy cross freely
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Answer: Mass cannot cross the boundary, energy can
A closed system holds a fixed amount of matter, but heat and work can still pass through its boundary.
2. A perfectly insulated, sealed flask with nothing entering or leaving approximates which kind of system?
- An isolated system
- An open system
- A control volume
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Answer: An isolated system
An isolated system exchanges neither mass nor energy with its surroundings; good insulation and a seal come close.
3. A car radiator with coolant flowing in and out is best analyzed as...
- An isolated system
- A control volume
- A closed system
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Answer: A control volume
When mass crosses the boundary, engineers draw a fixed region in space, a control volume or open system, around the device.
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