Just curious, build up of frost in a fridge

[jfreak_]

Just curious , does anyone know how frost builds up in a fridge? This is something that has been nagging at the back of my mind for a long time.

[mips]

http://home.howstuffworks.com/question144.htm

This frost forms when water vapor hits the cold coils. The water vapor condenses -- turns to liquid water. Think of the water beading up on a glass of iced tea on a summer day -- that is an example of water vapor in the air condensing. The same thing happens on the ice-cold freezer coils, except that when the water condenses onto the coils it immediately freezes.