I have heard the Urban Legend that if you chill a Canadian
2-dollar coin in Liquid Nitrogen, the central brass-coloured
part can be pushed out of the surrounding silver-coloured
part. If this is true, I would like to use it to demonstrate
Thermal Expansion to my physics class. I have the twoonie,
I can get the liquid nitrogen, but I have no idea if the
legend is true.
1) Has anyone actually done this?
2) Did it work?
3) Once chilled, what did it take to get the center to
actually pop out (hammer, screwdriver, dropping the coin
on a hard floor, etc.)?
- posted 16 years ago