Why did the ice melt faster on Al?

Question

My physics teacher brought two tiles of matter: aluminum(feels cold) and wood(feels warm); they both were painted black and the temperatures were same. He laid them on the table and put two ice cubes on them. The ice on the Al tile melted about 3-5 min. completely; the one on the wood tile melted about 20 min. completely. Why would the ice cube melted faster on the Al tile even though Al feels colder than wood?

Additional question: At the same temperature, why does the marble floor feels colder than carpet?

Answer 1

The thermal conductivity of Aluminum is much greater than that for the insulator wood. It therefore transfers the heat it absorbs from the air efficiently to the ice. The thermal contact between the Aluminum-Ice (physically touching) is also much better than the Aluminum-Air contact and so the Aluminum will be closer to the temperature of the melting ice than to the air.



First, your body is usually warmer than the surrounding air and so it is hotter than the marble and rug. With the carpet the heat from you hand can't easily be transferred to the carpet because the thermal conductivity of the carpet is very low. Also the carpet fibers and your hand don't make a good even surface contact. Less contact area, less transfer of heat.

Your hand makes a much better contact with the marble, in terms of surface area. The greater contact area together with the better thermal conductivity makes the marble "pull" heat from your hand faster and so it feels colder.

Answer 2

The reason it feels colder is because it conducts heat better, aka it draws more heat away from whatever is touching it. The reason the ice melted faster is because Al acts like a heatsink, it draws heat from the environment faster than wood (which is an insulator). metals and tile (and similar materials) will transfer heat faster, thus causing objects on it to cool down or heat up faster than insulators. Wood is a good insulator, so is foam, carpet, wool, etc. the reason those objects feel warmer is because they are poor conductors of heat, thus when heat is not drawn as fast from your hands, they "feel" warmer.

Answer 3

Al distributes temps faster than wood and doesn't store the coldness and heat like wood. That's why AL is used so much in automotives. The Marble holds the cold in the stone and carpet allows airflow to dissapate the temps.

Answer 4

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Answer 5

Yes, back in the day they would use sawdust to transfer ice blocks.