Description
Two black bricks. One feels warm, the other cold. On which will the ice cube melt first? You will be amazed by Andreas Wahl's incredible melting blocks.
Andreas Wahl has dusted off this classic science experiment. The concept of thermal conductivity has never before caused so many people to gape. The effect surprises most people, and provides immediate, practically useful knowledge.
Here's how you do it:
Place the two bricks on the table, and note which one feels the coldest. One is clearly the coldest. Then put a rubber ring on each block, to prevent the ice cubes from sliding off. Finally, place an ice cube on each brick, and carefully observe what happens.
This is how Andreas Wahl's incredible melting blocks work :
If the two blocks have been in the same place for the last half hour, they are exactly the same cold or hot. One feels colder, because it effectively conducts heat away from your skin. The other brick feels warmer, because it conducts heat very poorly. It insulates.
Now one would intuitively believe that the brick that feels the hottest melts the ice cube the fastest. But the opposite is the case! The block that felt the coldest is the best at conducting heat. It therefore quickly conducts heat from the surroundings to the ice cube. The block that felt warm insulates well, and the ice cube hardly melts at all.
What material do you think Andreas Wahl's incredible melting blocks are made of? What material would you use to make a thermos or cooler?
You receive:
2 Andreas Wahl's incredible melting blocks (10x10x1 cm), rubber rings and Norwegian instructions
Andreas Wahl's incredible melting blocks