+An **enclosed system** is a [thermodynamic](/wiki/thermodynamics) system that permits energy to transfer across its boundary, but strictly prohibits the transfer of [matter](/wiki/matter). Within its defined limits, the total amount of substance remains constant, creating a contained environment for study.
+## See also
+- [Open System](/wiki/open_system)
+- [Isolated System](/wiki/isolated_system)
+- [System](/wiki/system)
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