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→About Systems
===About Systems===
There are three important types of [[system]] which can be [[observed]] by a [[scientist]]:
*[[Open System]] - In an [[Open System|open system]] [[mass]] and [[energy]] get can get in and out. In these [[system]]s the laws of [[Conservation of Energy]] and [[Conservation of Mass]] cannot be observed.
*[[Closed System]] - In a [[Closed System|closed system]] [[mass]] cannot get in or out, but energy can. In these [[system]]s the law of [[Conservation of Mass]] can be [[observed]] but the law of [[Conservation of Energy]] cannot.
*[[Closed Isolated System]] - In a [[Closed Isolated System|closed isolated system]] neither [[mass]] nor [[energy]] can get in or out. In these [[system]]s both the laws of [[Conservation of Energy]] and [[Conservation of Mass]] can be [[observed]].