我正在阅读关于月球地幔中的水，然而它提到了很多逃逸。在这种情况下是什么意思?< / p >
Most often in geology, this will refer to 'fugacity of oxygen (fO2)' in a system - this is effectively a measure of how reactive oxygen is, and thus how oxidized a given system will be, usually with respect to the minerals that are stable in them.
At temperatures that most mantle processes operate on, aqueous fluid phases generally exist in a supercritical state, which we also apply the concept of fugacity to. So, if the text you are reading states something about 'fugacity of H2O', then it is likely referring to the reactivity of supercritical water vapor in the lunar mantle system.