Abstract: A method and apparatus for generating gaseous hydrogen by the reaction of a metal and an aqueous salt solution is provided wherein the method comprises:A. forming a powder from a pressed blank of the metal; andB. introducing said powder as it is formed into an aqueous salt solution.

Abstract: Apparatus for controlling the electrolyte level and electrolyte concentration of fuel cell batteries, which comprises an electrolyte vessel and a tube, open on both sides and having an overflow at a distance h from its lower end, with its lower end immersed in the electrolyte vessel and the reaction water depleted in the fuel cell battery supplied to its upper end, in which apparatus h is selected such that h = l .multidot. .gamma..sub.1 /.gamma..sub.0 where l is the immersion depth of the tube in the electrolyte vessel, .gamma..sub.1 the density of the electrolytic liquid and .gamma..sub.0 the density of the depleted reaction water.