I just heard about entropy from another thread, so I had to go and google it, I lightly skimmed this wiki page: http://www.google.ca/imgres?hl=en&s...w=192&start=0&ndsp=19&ved=1t:429,r:6,s:0,i:87. It may be a little advanced for me but I don't really understand how the total entropy can increase. If, for example you have an air conditioner in a room and the air conditioner is extracting the heat from the air in the room and transferring the excess heat to outside (the external air), wikipedia (although unreliable) claims that more heat is transferred to the external atmosphere than is extracted from the room. Following conservation of energy, this is not possible. So where is the excess heat coming from? Is it taking into account the electrical inefficiency of the wiring generating the extra heat?