TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The method is conducted in a reaction control mechanism comprising: the solid fuel mixture; the liquid fuel reactant that is contained within a reservoir and reacts with the solid fuel mixture to produce reaction products; the primary LDM fluidly connected to and configured to deliver the liquid fuel reactant to the solid fuel mixture and to connect the reservoir to the solid fuel mixture; the MBI coupled to the primary LDM distal the solid fuel mixture; the reaction zone defined between the solid fuel mixture and the primary LDM; and the second LDM located in the reaction product path exiting the reaction zone. Preferred Components: The reaction product path comprises: at least one channel defined in a surface of the solid fuel mixture, at least one channel disposed through the solid fuel mixture, at least one helix channel disposed about the solid fuel mixture, and/or at least one conduit abutting the solid fuel mixture; and guides disposed in the reaction product path. The guides are disposed to provide the liquid fuel reactant to the reaction zone. The secondary LDM is disposed to provide the liquid fuel reactant independently from the primary LDM. The solid fuel mixture and the liquid fuel reactant react through a hydrolysis reaction. The solid fuel mixture comprises at least solid sodium borohydride. The MBI moves according to a physical moving element providing a force by an elastic membrane. The elastic membrane comprises an elastic polymer of fabric, a heat shrinkable fabric and/or a spring sheet. The primary LDM is a stationary LDM, receives a compression force from the MBI, and provides liquid to the reaction product path. The reaction production path is disposed between a surface of the solid fuel mixture and the MBI, and fluidly passes the reaction products away from the reaction zone. The MBI is an elastic membrane disposed to envelope the solid fuel mixture, such that when the reactants are present in the reaction product path the elastic membrane is disposed to apply a pressure on the reactants to propagate the reactant along the reaction product path. The elastic membrane pressure applied to the reactants is a variable pressure. A pump is fluidly connected to the primary LDM. The reaction products exiting the reaction zone comprises a combination of a partially reacted liquid fuel reactant and the solid fuel mixture. The delivery of the primary LDM comprises the liquid fuel reactant so as to contact the solid fuel mixture controls the rate and amount of the hydrogen gas produced. The secondary LDM fluidly connects the reservoir to the reaction product path to control an overall reaction stoichiometry. The reaction product path, defined in the solid fuel mixture, fluidly connects the reaction zone defined between the solid fuel mixture and the primary LDM with area external the reaction control mechanism. The secondary liquid delivery medium fluidly connects the liquid fuel reactant to the reaction product path. EXAMPLE - No suitable example given.