March 31, 2013 Leave a comment
In the early morning, especially here in Canada, I often see dew – water droplets formed by the condensation of water vapour on outside surfaces, like windows, car roofs, and leaves of trees. I also sometimes see fog – water droplets or ice crystals that are suspended in air and often blocking visibility at great distances. Have you ever wondered how they form? It turns out that partial pressure, vapour pressure and temperature are the key phenomena at work.