Heat transfer - the science
You guys should send this to Brainiac!! - see the difference in heat loss of a bikini clad girl in a 10degree pond and a -10 degree pond!!
onto the serious
heat is energy dissapation of the molecules bouncing around colliding with each other - the more energy, the faster, the more collisions, the more heat. Lower the heat, less collisions, less speed, less heat.
heat transfer - so u have some air thats hot with molecules moving rapidly meets cold air with slow molecules - the two meet and the fast molecules at the edge of the hot air collide with the slow molecules at the edge of the cold air and this collision imparts some of the hot air molecule energy into the cold air molecule, thus slowing down the hot air molecule (cooling) and speeding up the cold air molecule (heating) - then the law of equillibrium comes into effect and you end up with an even temperature .
so this is how the heat of one object is shared with another - law of equillibrium prevents the hot object getting colder than the cold object heats up to - without some external influence (an external source of energy)
hope this helps
ken