Eduard-Job-Foundation for Thermo- and Matterdynamics

Experiment 3.A: Ice Melting Blocks


Both blocks have room temperature. Nonetheless, one of the block feels cool whereas the other feels warm. Subsequently, an ice cube is placed in the middle of each block.

The ice on block A (which feels cool) melts much faster.

Block A is made of aluminum, block B, however, of high density foam. Aluminum is a very good entropy conductor, high density foam a very bad one. The entropy flow by conduction always takes place in the direction of a temperature drop. Therefore, the (warmer) metal transfers entropy to the (colder) ice, which begins to melt as a result. The metal block feels cool at the beginning for the same reason.

Video (mpg4, 0:48)