And state symbols in the brackets show which substances are solid, liquid ... of nitrogen and three atoms of hydrogen. We know this because the hydrogen symbol has a subscript three after it ...

On Jan 9, China's first ton-class liquid hydrogen-powered vertical takeoff and landing (VTOL) drone completed its maiden test flight in Baoji, Shaanxi province. [Photo by Wang Peipei/For ...

An FIA statement said: "Given the [liquid] tank’s characteristics ... that Extreme H would join forces with Formula 1 and the FIA to create a joint Hydrogen Working Group to evaluate how ...