# 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.

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?