NOVELTY - Hydrogen gas generating system (I) comprises: a reaction chamber (110) configured to contain a solid chemical hydride; at least one liquid reagent storage chamber (120) for containing an aqueous reagent; a liquid reagent conduit line (140) for conveying the aqueous reagent from the at least one liquid reagent storage chamber to the reaction chamber; an actuator configured to move the reaction chamber relative to the at least one liquid outlet (150) within the reaction chamber; a liquid reagent regulator; and a hydrogen gas outlet.    USE - (I) is useful for generating hydrogen gas (claimed) and other nongaseous products.    ADVANTAGE - (I) maximizes the hydrogen stored within a given volume. (I) offers the potential of compact and safe hydrogen storage.    DETAILED DESCRIPTION - Hydrogen gas generating system (I) comprises: a reaction chamber (110) configured to contain a solid chemical hydride; at least one liquid reagent storage chamber (120) for containing an aqueous reagent; a liquid reagent conduit line (140) for conveying the aqueous reagent from the at least one liquid reagent storage chamber to the reaction chamber, where the liquid reagent conduit line includes at least one liquid outlet within the reaction chamber; an actuator configured to move the reaction chamber relative to the at least one liquid outlet (150) within the reaction chamber; a liquid reagent regulator; and a hydrogen gas outlet, where the reaction of the chemical hydride and the aqueous reagent generates hydrogen and a nongaseous product. INDEPENDENT CLAIMS are included for:    (1) a hydrogen fuel cartridge comprising: a reaction chamber and a liquid fuel storage chamber contained within a housing, where the reaction chamber and the liquid fuel storage chamber are arranged in volume exchanging configuration; a liquid reagent conduit line for conveying the aqueous reagent from the liquid reagent storage chamber, where the liquid reagent conduit line terminates in at least one fixed liquid outlet within the reaction chamber; an actuator configured to move the reaction chamber relative to the at least one fixed liquid outlet within the reaction chamber; at least one hydrogen separator; and a hydrogen outlet; and    (2) a method of generating hydrogen comprising: providing a solid chemical hydride in a reaction chamber; providing an aqueous reagent; conveying the aqueous reagent through a distribution point to contact the chemical hydride in the reaction chamber and to produce hydrogen gas and a nongaseous product; and moving the reaction chamber relative to the aqueous reagent distribution point within the reaction chamber.    DESCRIPTION OF DRAWING(S) - The figure shows a hydrogen generation system.    Reaction chamber (110)    Liquid reagent storage chamber (120)    Movable wall (130)    Liquid reagent conduit line (140)    liquid outlet. (150)