The dew point is the temperature at which air is saturated with water vapor, which is the gaseous state of water.
I have also read that Dew point is closely linked to relative humidity, which is the ratio of the pressure of water vapor in a parcel of air relative to the saturation pressure of water vapor in that same parcel of air at a specific temperature.
Is this satisfying description?
Yes, I have noticed that, and also research on it last night.
I sum up with this:
The fog in the mirror is the moisture of water vapor as it abuts a colder surface. With the cold water, we just cool down the bathroom. So the vapor came from the hot shower, mostly condense and will not reach the mirror.
At the same time, if we do something opposite like vapor comes from heat or hot air will become less likely on the warmer surface.
For air containing a certain amount of moisture, there is a maximum temperature at which the water will Epitomize. This is called the dew point.
Right?