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Re: Physics help (I found it!)

>> Kelly:
>>>No, my Explorer design doesn't use on board fuel for accell out of the sol
>>>system, or return decel.  A bigger problem Is I forgot the 2e7 exaust
>>>velocity was for a He3 system which obviously isn't very feasable for 17
>>>years of onboard storage.  (Liquid helium is incredibly good at geting out of
>>>sealed containers.)  I havent bothered to try to figure out the numbers for
>>>Li6 fueled system yet.  But I remembered they sounded bad.
>>Keep in mind that the temperature where Helium becomes fluid and the
>>temperature where Helium becomes superfluid are not the same, there is a
>>difference of about 2 degrees between them.
>I think maybe Kelly was refering to the half-life of tritium, rather than the 
>superfluid properties.

Why then is he worring about liquid Helium being incredibly good at getting
out of sealed containers?