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In a fictive reversible process, an infinitesimal increment in the entropy () of a system is defined to result from an infinitesimal transfer of heat () to a closed system (which allows the entry or exit of energy – but not transfer of matter) divided by the common temperature () of the system in equilibrium and the surroundings which supply the heat:

In a fictive reversible process, an infinitesimal increment in the entropy () of a system is defined to result from an infinitesimal transfer of heat () to a closed system (which allows the entry or exit of energy – but not transfer of matter) divided by the common temperature () of the system in equilibrium and the surroundings which supply the heat:

在<font color = 'red'><s>设置的虚拟</s></font> <font color = 'blue'>假想的</font>可逆过程中，系统的熵的无穷小增量<math>dS</math>被定义为由无穷小的热<s>量</s><math>δQ</math>传递到一个封闭系统(允许能量进入或出去，但不允许物质传递<blue>的系统</blue>)除以<blue>该</blue>平衡系统和提供热<s>量</s>的环境的共同温度 <math>T</math>:

在<font color = 'red'><s>设置的虚拟</s></font> <font color = 'blue'>假想的</font>可逆过程中，系统的熵的无穷小增量<math>dS</math>被定义为由无穷小的热<s>量</s><math>δQ</math>传递到一个封闭系统(允许能量进入或出去，但不允许物质传递<font color = 'blue'>的系统</font>)除以<font color = 'blue'>该</font>平衡系统和提供热<s>量</s>的环境的共同温度 <math>T</math>: