Take cylinders made of aluminium, iron and copper having same mass and same area of cross section. Place them in boiling water. After some time, the temperature of these cylinders will be equal to that of the boiling water. Remove these cylinders at the same temperature from boiling water and place them on plank made of wax Fig (3.12). Which of these cylinders is found to penetrate deepest into the wax? Which of them has penetrated the least? Why?
thanks in advance.
equal mass & temperature which penetrates more in wax? Watch
- Thread Starter
- 21-12-2010 09:01
- 21-12-2010 10:53
Do you know the values for the thermal conductivity of these 3 metals?
- 21-12-2010 10:58
It depends on the relative temperatures of the wax and the ambient air at the start of the experiment. If they're the same temperature then I would imagine the wax would absorb more heat as it is using it to melt. So heat would be transferred within the cylinders towards the wax, so the one with the highest conductivity would win. If you did the experiment in a big freezer (without precooling the wax) then it would most likely be the other way round.