On 17Jul2017 2201, Tim wrote:
> On Mon, Jul 17, 2017 at 04:32:52PM +1200, Rupert Boleyn wrote:
>> Thus a DTon (14m^3) of each has a following characteristics:
>>           Mass                  Mass of Hydrogen
>> Glucose  1.540 x 14 = 21.560   0.0671 x 21.560 = 1.45 tonnes
>> Fructose 1.694 x 14 = 23.716   0.0671 x 23.716 = 1.59 tonnes
>> Sucrose  1.587 x 14 = 22.218   0.0648 x 22.218 = 1.44 tonnes
>
> Solid methane is pretty decent.  Just more than 25% of its mass is
> hydrogen, and it has a density just under 500 kg/m^3 at 70 K, for a
> total of 1.75 tonnes hydrogen per dton.  It should also be extremely
> common on outer system bodies.  At liquid hydrogen temperatures, its
> density is slightly greater at 520 kg/m^3, for a total of 1.83 tonnes
> hydrogen per dton.

That does look pretty good, and cyrogenic storage in interstellar space
will be pretty easy, so the temperature isn't really a problem.

Note that I didn't go through all the common biological sugars, fats,
and oils to see if some were better than sugar and olive oil. In fact
the olive oil was a sudden thought just before I was going to hit 'send'
on the sugar stats. FWIW glycerol runs at about 1.55 tonnes of hydrogen
per DTon, as do many triglycerides.

--
Rupert Boleyn <xxxxxx@gmail.com>
Chief Assistant to the Assistant Chief