NOVELTY - A self-regulating gas generator (10a) comprises a chemical supply chamber (41); at least one piston (30a) interacting with a chemical supply (42); a catalyst (32) coupled to the piston decomposing the supply into a generated gas (43); a gas storage chamber (40); a gas permeable structure (36) through which the generated gas passes from the supply chamber to the gas storage chamber; and a feedback system.    USE - For generating gas e.g. hydrogen gas, oxygen for use with fuel cells, gas combustion device, respiratory device (claimed) that are useful in military, industrial, and consumer applications.    ADVANTAGE - The self-regulating gas generator provides portability and has safety characteristics suitable for military, industrial, and consumer applications. The self-regulating gas generator exhibit long life span of catalyst used to generate gas from chemical supply based on the self-regulating features. The gas generator generates gas for diverse portable power generation applications in a manner that automatically increases or decreases gas production rates in response to usage requirements. The simplicity of the solid piston reduces the cost to provide disposability. If the hydrogen gas pressures becomes too large, the system automatically shuts itself down.    DETAILED DESCRIPTION - The feedback system utilizes force generated by pressure in at least one of the chambers to position the catalyst in the chemical supply to regulate rate of generation of the gas. The piston rotates relative to the chemical supply chamber; remains in a fixed position relative a body that includes the chemical supply chamber; or alters the amount of catalyst exposed to the chemical supply. The chemical supply is a liquid, solid or gas dissolved in water/gas adsorbed is solid. The piston includes multiple channels to allow the generated gas to flow.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram illustrating operation of the gas generator.    Gas generator (10a)    Piston (30a)    Catalyst (32)    Gas permeable structure (36)    Gas storage chamber (40)    Chemical supply chamber (41)    Chemical supply (42)    Generated gas. (43)