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What is an open system?

User JMSH
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Answer:

A system that allows energy and mass to move in and out of it.

APEX

User Cybujan
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An open system is a system that freely exchanges energy and matter with its surroundings. For instance, when you are boiling soup in an open saucepan on a stove, energy and matter are being transferred to the surroundings through steam.
User Paglian
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