So, that's a homogeneous system, one phase. You have to know if your system is an equilibrium system or not.

所以这是个均匀系统，只有一个相，你得知道你的系统,是不是个平衡系统。

麻省理工公开课 - 热力学与动力学课程节选

It tells you the phase.

告诉你系统的相。

麻省理工公开课 - 热力学与动力学课程节选

Your stomach is a very complex organ that has a muscle layer, it has an epithelial layer which is the interface with food that comes in, and it also has a nervous system, so does the heart.

你的胃是一个非常复杂的器官,它拥有一个肌肉层,有一个与摄入的食物,相接触的表皮层,也有一套神经系统,心脏也有

耶鲁公开课 - 生物医学工程探索课程节选

You're going to have to know when you describe the system, if your system is homogeneous, like your coffee with milk in it, or heterogeneous like water with an ice cube in it So heterogeneous means that you've got different phases in your system.

你要知道,当你描述一个系统时，你的系统是均匀的呢，像掺了牛奶的咖啡，那样还是非均匀的，像放了冰块的水,非均匀系统就是说,在你的系统中有不同的相存在。

麻省理工公开课 - 热力学与动力学课程节选