hydrogen generated from methane feedstock, typically from natural gas/petroleum gas, whose carbon residue, typically carbon dioxide, is captured, resulting in a low-carbon process.

Alternative spelling of oxyhydrogen

The solid phase of hydrogen; frozen hydrogen state / Synonym of metal hydride / A metal lattice which has absorbed hydrogen gas / Used other than figuratively or idiomatically: see solid, hydrogen.

plural of hydraulic horsepower

(chemical engineering) The amount of pressure multiplied by the volumetric flowrate.

Alternative form of gray hydrogen

hydrogen generated from hydrocarbon sources without attempting to capture and eliminate the waste carbon pollution