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: A [[system]] is an [[object]] or a group of [[object]]s being studied.
: In [[Closed System|closed system]]s [[energy]] can enter and escape. This may appear as an increase or a decrease in [[temperature]] caused by the surroundings but not by the [[system]].
: In a [[Closed System|closed system]] [[mass]] cannot enter and or leave.
: In these [[Closed System|closed system]]s the law of [[Conservation of Mass]] can be [[observed]] but the law of [[Conservation of Energy]] cannot.