I would have nice, cold grape juice. Heat Transfer Let's say you take a glass of ice water or a bowl of hot soup and let them sit out on the kitchen table. You know what will happen. The bowl of soup will cool down to room temperature, and the glass of ice water will warm up to room temperature. This is a thermodynamic fact of life - if you have any two objects with different temperatures together in a closed system, they will resolve themselves to the same temperature by heat transfer.
Heat is atomic motion.
At the temperature absolute zero there is no atomic motion. But as atoms get warmer they move. Heat is transferred when one atom runs into another. When this happens, it is a little bit like billiard balls colliding - the second atom picks up some of the motion of the first atom. Heat is transferred by these collisions.