Eduard-Job-Foundation for Thermo- and Matterdynamics

Experiment 3.A: Ice Melting Blocks

Ice-melting-blocks.jpg

Procedure:
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.

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

Explanation:
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)