Appearance: Yellow compressed gas with pungent odour ; Pale-yellow to greenish gas with a pungent, irritating odor.
Names: Dihydrogen, Hydrogen, H2
Appearance: Odourless colourless compressed gas
HF – Fluorane
Other names: Hydrofluoric acid, Hydrogen fluoride, Fluorhydric acid
Appearance: Colorless solution ; Colourless gas or colourless liquid (below 19.5 °C) ; Colourless gas or colourless fuming liquid with pungent odour ; Colourless fuming liquid with pungent odour ; Colorless gas or fuming liquid (below 67°F) with a strong, irritating odor. [Note: Shipped in cylinders.]