In this unit I learned how convection heats a room. First the warm air comes out of the furnace,then it rises to the top of the room. Then it starts to cool so it loses energy,and sinks to the ground and then into the air vent and repeat. Also I learned that matter expands when heated and contracts when it gets cold. Another thing I learned was that the metal things on the bridges were for expansion and contraction. The thing I liked best was that we did a lot of labs. I really liked everything, there was nothing I hated. What I want to know are examples of convection and radiation.