The movement of energy from 1 to another without moving the objects themselves. When I sit on the couch & the couch is 69 degrees Fahrenheit, I am 98.6 degrees Fahrenheit, I will transfer heat just due to the fact that I am a different temperature. The substances will heat up due to my rump and it will go along the couch. We will eventually reach a point of equilibrium. Let us say 86.53 degrees.