Fogging is a phenomenon observed commonly in applications of plastic films in the food packaging specially in the fruits,salad and vegetables packaging The term Fog describes the condensation of water vapour, in the form of small discrete water droplets, on a plastic film surface when an enclosed mass of air cools to a temperature below its dew point. The extent of the phenomenon depends on the actual temperature and relative humidity of the enclosed air mass, as well as the temperature of the plastic film.
