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The zeroth law of thermodynamics defines thermal equilibrium and forms a basis for the definition of temperature:  If two systems are each in thermal equilibrium with a third system, they are in thermal equilibrium with each other.

The zeroth law of thermodynamics defines thermal equilibrium and forms a basis for the definition of temperature:  If two systems are each in thermal equilibrium with a third system, they are in thermal equilibrium with each other.

'''<font color="#ff8000"> 热力学第零定律zeroth law of thermodynamics</font>'''定义了'''<font color="#ff8000"> 热平衡thermal equilibrium</font>'''，并为温度定义奠定了基础：如果两个系统都与第三个系统处于热平衡，则它们彼此也处于热平衡。

'''<font color="#ff8000"> 热力学第零定律zeroth law of thermodynamics</font>'''定义了'''<font color="#ff8000"> 热平衡thermal equilibrium</font>'''，并为温度定义奠定了基础：如果两个系统各与第三个系统处于热平衡，则它们彼此也处于热平衡。

The first law of thermodynamics: When energy passes, as work, as heat, or with matter, into or out of a system, the system's internal energy changes in accord with the law of conservation of energy. Equivalently, perpetual motion machines of the first kind (machines that produce work with no energy input) are impossible.

The first law of thermodynamics: When energy passes, as work, as heat, or with matter, into or out of a system, the system's internal energy changes in accord with the law of conservation of energy. Equivalently, perpetual motion machines of the first kind (machines that produce work with no energy input) are impossible.

'''<font color="#ff8000"> 热力学第一定律first law of thermodynamics</font>''':当能量以'''<font color="#ff8000"> 功work</font>'''、'''<font color="#ff8000"> 热heat</font>'''或物质的形式进入或离开一个系统时，系统的'''<font color="#ff8000"> 内能 internal energy</font>'''根据能量守恒定律发生变化。同样地，第一类永动机机器(不需要能量输入就能工作的机器)是不可能造成的。

'''<font color="#ff8000"> 热力学第一定律 first law of thermodynamics</font>''': 当能量以'''<font color="#ff8000"> 功work</font>'''、'''<font color="#ff8000"> 热heat</font>'''或物质的形式进入或离开一个系统时，根据能量守恒定律, 系统的'''<font color="#ff8000"> 内能 internal energy</font>'''发生变化。同样地，第一类永动机机器(不需要能量输入就能工作的机器)是不可能造成的。