Physics
Grade-9
Easy

Question

The following picture represents a/an _____.

  1. Open system
  2. Isolated system
  3. Heat
  4. Heat and matter

hintHint:

The energy transfer into or out of the system may happen. When the balloon is inflated by air, the matter is crossing the system boundary, Hence It is an example of an open system.

The correct answer is: Open system


    hot air balloons are open systems—not closed, but again, the use of helium necessitates that the balloon be closed. In addition, hot-air balloons carry their heat source on board and can stay aloft as long as their fuel lasts.

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