> The *reason* you can use hydrogen as a simple fuel is that it oxidizes > so readily. It spontaneously combusts in air, in fact. With a "boom!" We filled a few hundred little balloons with hydrogen and let go of them last year. Not one went "Boom!!" -- Phil Payne http://www.isham-research.com/quattro +44 7785 302 803 +49 173 6242039