Tony wants to figure out which materials conduct heat better than others. To do this, he fills cups that are made out of different materials with equal amounts of ice water. He then keeps track of how much time it takes the ice to completely melt in each cup. His results are below.
Time for Ice to Melt
Cup Material Time to Melt
plastic 32 minutes
glass 21 minutes
aluminum 15 minutes
foam 38 minutes
Which material was the best conductor of heat?