WTimeline of hydrogen technologies
WAtomic hydrogen welding
WBalloon (aeronautics)
WBalloon mail
WBubble chamber
WBussard ramjet
WCathodic protection
WCathodic protection
WCompressed hydrogen
WCryogenic rocket engine
WDirect reduced iron
WDöbereiner's lamp
WFuel cell
WHCNG
WHigh-pressure electrolysis
WHofmann voltameter
WHydrogen maser
WHydrogen pipeline transport
WHydrogen valve
WHydrogen vehicle
WHydrogen-cooled turbo generator
WIntegrated Sensor is Structure
WIonic liquid piston compressor
WIron–hydrogen resistor
WKytoon
WLimelight
WLiquid hydrogen
WLiquid organic hydrogen carriers
WMembrane electrode assembly
WNickel–hydrogen battery
WOxy-fuel welding and cutting
WOxyhydrogen
WSpin isomers of hydrogen
WU-1 (semi-trailer)
WUnited States hydrogen policy