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a hot air balloon is an example of what type of system ? an open system ? a closed system ? or a isolated system ?
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a hot air balloon is an example of what type of system ? an open system ? a closed system ? or a isolated system ?

User ByteMe
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Answer:

open system

Step-by-step explanation:

User TH Todorov
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Answer:

Also, hot air balloons are open systems—not closed, but again, the use of helium necessitates that the balloon be closed.

Step-by-step explanation:

User Jansanchez
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