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March 23rd 04, 10:18 PM

John Michael Williams

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(Don Klipstein) wrote in message ...
In article , John
Michael Williams wrote:
...

I thought the ultimate energy per mass was magnesium and oxygen (or was
it beryllium and oxygen?), just a few times as much energy per mass as TNT
and not good like usual rocket propellants for producing gas to use as
rocket exhaust.

It depends on the electrochemical gradient, I think.
Hydrogen burning in fluorine probably produces more combustion
energy than anything else, per unit mass.

That one is up there, but let's check heat of formation...

HF gas: 63.991 KCal/mole, 3.19955 KCal/gram

MgO: 145.76 KCal/mole, 3.644 KCal/gram, but with no gaseous output.

Right. Agreed, although in water, HF produces 78.6 kCal/mole,
putting it ahead of MgO by mass.

The gaseous output would subtract heat energy, so if the goal was
radiant heat and not momentum, MgO would be 'way ahead.

...

John

John Michael Williams

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