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Systems in thermodynamics are classified
as isolated, closed, or open based on the possible
transfer
of mass and energy across the system boundaries. An isolated
system is one that
is not influenced in any way by the surroundings. This
means that no energy in the form of heat or work may cross
the boundary of the system. In addition, no mass may cross
the boundary of thesystem.
A thermodynamic system is defined as a
quantity of matter of fixed mass and identity upon which
attention is focused for study. A closed
system has no
transfer of mass with its surroundings, but may have a
transfer of energy (either heat or work) with its
surroundings.
An open
system is one that
may have a transfer of both mass and energy with its
surroundings.
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