> [Nickel](https://en.wikipedia.org/wiki/Nickel_%28United_States_coin%29)
> value per volume:
> 
> $$\frac{5 ¢}{\pi(\frac{21.21}{2}\ \text{mm})^2 * 1.95\ \text{mm}} = \frac{7.257 ¢}{\text{ml}}$$
> 
> [Dime](https://en.wikipedia.org/wiki/Dime_%28United_States_coin%29):
> 
> $$\frac{10 ¢}{\pi(\frac{17.91}{2}\ \text{mm})^2 * 1.35\ \text{mm}} = \frac{29.40 ¢}{\text{ml}}$$
> 
> So, for large volumes with reasonable dimensions$\dagger$, if you had
> twice the volume of nickels as dimes, the nickels would worth about
> half as much as the dimes.
> 
> 
> $\dagger$ I say *reasonable dimensions* because fringe effects come
> into play if you have to pay attention to the coins bumping into the
> wall.