Quote:
Originally Posted by Curmudgeon
Under Avogadro's Law, two identical volumes at the same temperature and pressure will contain the same number of particles of gas, regardless of the densities involved, i.e. a cylinder of helium will have exactly as many individual molecules of helium as the same cylinder filled with oxygen would have, despite oxygen being denser than helium. It thus follows that, in gaseous form, the relative energy density of two forms of matter for fuel purposes in an antimatter powerplant is directly proportional to the number of particles composing the nuclei of that matter. (In other words, what isotope you're using makes a difference.)
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Here's the big problem, though - volume is not a factor in GURPS Spaceships. A tank of hydrogen, water, rock dust, or nuclear pulse units all behave the same in all respects except what rocket uses them.