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Posted by Ian Stirling on January 28, 2006, 4:52 pm
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> psturroc@gmail.com wrote:
>
>> Are there any rocket fuels -- existing or potential -- that are less
>> polluting than kerosene or hydrogen? If so, are any of them
>> economically feasible?
>
> I can't imagine anything less polluting than hydrogen. The only possible
> combustion product of hydrogen is water, regardless of temperature or mix
> ratio.
Several people have mentioned this, but it's not quite true.
Of course, only water comes from the reaction of oxygen and hydrogen.
But, when a several km/s jet of any form hits air, it's quite hot and
energetic enough to cause nitrogen oxides to form.
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> polluting than kerosene or hydrogen? If so, are any of them
> economically feasible?