Why is the saturation decreasing with temperature?

As you can see below, I’d like to know why the saturation is decreasing with the temperature while the absolute amount of water remains constantly.
The image is taken from a description of a transformer where the relative humidity in oil is decreasing with the temperature, so I’d be happy if an explanation could fit to the image.

enter image description here

I asked a similar Why has warm air a higher water saturation than cold air? but meanwile I think it doesn’t really explain the reason. But maybe I miss the forest for the trees.

However: Why is the relative humidity decreasing with the (oil) temperature?

Physics Asked on November 21, 2021

1 Answers

One Answer

Relative humidity is defined as 100 times the partial pressure of the water vapor in the moist air divided by the equilibrium vapor pressure of the water vapor at the temperature of the air mixture. The equilibrium vapor pressure always increases with temperature. So, for a fixed amount of water vapor in the air (i.e., a fixed partial pressure at constant total pressure), increasing the temperature lowers the relative humidity.

Answered by Chet Miller on November 21, 2021

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