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In thermodynamics, what does the term open system refer to?

In thermodynamics, what does the term open system refer to? Correct Answer Control volume

In thermodynamics, an open system freely exchanges matter and energy with its surroundings. For instance, when you are boiling water in an open bowl on a stove, energy and matter are being transferred to the surroundings through steam. In this case, the volume remains constant making it a control volume process.

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