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: In a [[Closed Isolated System|closed isolated system]] [[mass]] cannot enter or leave.
: In [[Closed Isolated System|closed isolated systems]] both the laws of [[Conservation of Energy]] and [[Conservation of Mass]] can be [[observed]].
: Perfectly [[Closed Isolated System|closed isolated system]]s are not possible. However, for an [[experiment]] an [[opaque]] sealed contained which is [[Thermal InsulationInsulator|thermally insulated]] is close to a [[Closed Isolated System|closed isolated system]].