Portable, On-Demand High Altitude Balloons via Aluminum Fuel

Reactors for producing hydrogen gas and associated methods are described. In some embodiments, a system for producing hydrogen gas includes a reactant reservoir, a water reservoir, and a reactor chamber. When the reactant is combined with the water in the reactor chamber, hydrogen gas is produced. A regulator may be used to regulate the outlet pressure of the hydrogen gas. The system may also include sensors configured to sense parameters of the reaction and a processor coupled to the sensors. The processor may control the amount of water and reactant provided to the reactor chamber based on the sensed parameters.