Hydrogen gas has very low density at ambient temperatures and pressures.
Hydrogen molecules typically undergo some conditioning to make their distribution and use more practical. Common techniques include gas compression and/or liquefaction by reducing its temperature.
A source of low pressure and low-density gaseous hydrogen can be passed through a compressor to achieve a higher pressure a higher density fluid state.
A source of gaseous hydrogen can be cooled to temperatures on the order of -250°C (-423°F).