Having only taken a freshman level chemistry class 6 years ago, and forgotten almost all of it (and stupidly sold the book back) here's the question.


Assume you have whatever the "critical mass" is of, say, uranium.

Is the amount required for "critical mass" dependant on shape?  (not knowing what numbers are realistic, the following stupid question can be exceedingly stupid)

Say the critical mass is 10 kg.  Is that 10 kg regardless of its shape?  For sake of argument, say, a sphere vs a 2mm thick sheet.  Does shape matter?

Quoted: Yes. Must have surface area contact for critical mass to happen.

Ok...thats what made sense to me, but I figured I'd ask.

BTW, that was fast...even for arfcom