Discuss whether the following situations should bemodeled as closed systems or o

Question

Discuss whether the following situations should bemodeled as closed systems or open
systems.  Clearly define the system and its boundaries (graphically i.e. draw a picture of the system) and support your answer: Fire hose Mylar balloon Automatic drip coffee maker Computer Propane fuel tank   Car Exhaust System   Jet engine Wood Chipper Automobile fuel tank

Discuss whether the following situations should bemodeled as closed systems or open
systems.  Clearly define the system and its boundaries (graphically i.e. draw a picture of the system) and support your answer: Fire hose Mylar balloon Automatic drip coffee maker Computer Propane fuel tank   Car Exhaust System   Jet engine Wood Chipper Automobile fuel tank

Explanation / Answer

Fire Hose: Under non-use conditions, it is a closed system, as no matter can enter or leave it.

Mylar Balloon: A mylar balloon is sealed after filling it with hydrogen. No interaction of matter occurs. Hence, it is a closed system.

Computer: A computer constantly exchanges heat with surroundings via the flow of air in and out of it (the cooling fan is provided for that very purpose). Hence: open system.

Propane fuel tank: It is sealed in non use conditions. Hence a closed system, given it isn't being used. Else, an open system.

Car Exhaust System: Emissions enter the CC and leave it in a cleaner condition. Since constant in-out flow of matter occurs, it is an open system.   

Wood chipper: Under working conditions, it is a closed system, since once started, no wood is added or removed until that batch has been chipped.

Automobile Fuel tank: Open system, since it isn't sealed and fuel is drawn by the carburettor at will.   

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