From: del@branta.demon.co.uk   
      
   On Sat, 25 Feb 2006, in sci.space.tech,   
   Benjamin B  said:   
      
   >Can anyone explain to me if I'm mistaken and why... why don't heavy   
   >particles = more deltaV   
      
   Think of a tank full of particles. If the tank contains a ton of them   
   and the particles are a picogram each, there's 10^18 of them in the   
   tank. If they are a nanogram each, then each particle will have 1,000   
   times the momentum, but there will only be 10^15 of them in a ton, so it   
   all works out. The mass is taken care of in the "mass ratio" term, so   
   you don't have to worry about it in the exhaust.   
      
   --   
   Del Cotter   
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