WELDING - as a shielding gas ensures inert conditions for welding . 

PURGING and PRESSURIZING - for cryogenic installations . 

LEAK DETECTION - in high-vacuum or high-pressure equipment where tightness is crucial for safety reasons or long lifetime requirements. 

BREATHING MIXTURES - for deep sea diving or medical therapies. 

GAS CHROMATOGRAPHY - as a carrier gas for it's low solubility, inertness and high thermal conductivity. 

BALLOON and AIRSHIP INFLATION .