液壓系統中,什麼是飽和蒸氣壓

飽和蒸氣壓= saturated vapour pressure
I think that you should know what the evaporation(蒸發) is.
The pressure of the oil vapour is called vapour pressure(蒸氣壓) .
As the oil is in the closed container, the vapour pressure is also
called saturated vapour pressure .It means that there is the same
amount of the oil undergoing evaporation and condensation(冷凝).

When the external pressure equals to the saturated vapour pressure of
the oil, the oil will boil.
(So, when the external pressre is low , the oil will boil.)

1)在放入液壓系統中,既時候釋放出來的
2)should 在蒸氣時釋放出來的