The dew point is the
temperature below which the water vapor in a volume of humid air at a
constant barometric pressure will condense into liquid water.
Condensed water is called dew when it forms on a solid surface.
The dew point is the temperature the air would be at if it saturated at the present level of water vapour content. So dew point is related to air volume which is related to both temperature and pressure. Temperature would be the heat of the air around you. And air pressure is the force exerted onto a surface by the weight of the air. I hope I could help clarify it a little bit for you :D
