NOVELTY - An apparatus to generate hydrogen comprises a housing (210) having an opening and reservoir; button covering the opening; a separating plate (230) for dividing reservoir into two sub-rooms and has a through hole opposite to button, where the opening communicates with first sub-room to store liquid reactant; solid state reactant (240) disposed in second sub-room (210d) and separating membrane (250) to separate the sub-rooms. When the button is pushed it damages separating membrane so that liquid reactant flows to second sub-room through the through hole and reacts with solid reactant.    USE - For generating hydrogen for a fuel cell (claimed).    ADVANTAGE - The liquid reactant and solid state reactant are disposed in different sub-rooms of housing. When the button is pushed to damage the separating membrane for separating the sub-rooms from each other, the liquid reactant flows towards the solid state reactant due to gravity. Since the liquid reactant is not blocked by any object (such as water bag) while it flows through the through hole, the proportion of liquid reactant reacting with the solid state reactant increases and the efficiency of hydrogen generation increases as well.    DETAILED DESCRIPTION - An apparatus for generating hydrogen comprises: a housing (210) having an opening and a reservoir; a button connected to the housing and covering the opening; a first separating plate (230) disposed in the housing for dividing reservoir into two sub-rooms and has a through hole opposite to the button, where the opening communicates with first sub-room for storing a liquid reactant; a solid state reactant (240) disposed in second sub-room (210d); and a separating membrane (250) disposed on the through hole for separating first sub-room from second sub-room, where when the button is pushed, the button damages the separating membrane so that the liquid reactant flows to the second sub-room through the through hole due to gravity and the liquid reactant reacts with the solid state reactant to generate hydrogen. The button is connected to the housing in a thermal compression process. The button comprises: a plate body connected to the housing and covering the opening; a pushing piece connected to the plate body; and a piercing element fixing on the pushing piece and facing the separating membrane. The pushing piece is connected to the plate body in a double injection molding or adhering process. The apparatus further comprises a second separating plate disposed in the housing for defining a flow path which communicates the reservoir with the vent and a drying agent is disposed in the flow path.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of an apparatus for generating hydrogen.    Housing (210)    Second sub-rooms (210d)    Piercing elements (224)    First separating plates (230)    Solid state reactants (240)    Separating membranes (250)