The ordinary hydrogen at room temperature is a mixture of 75% ortho and 25% para hydrogen. On passing through activated charcoal kept 20K, the para variety is adsorbed leaving behind the ortho variety. From the charcol surface, para hydrogen can be released by reducing the pressure, In this way, the allotropes of hydrogen can be released by reducing the pressure,. In this way, allotrpes . In this way, the allotropes of hydrogen are separated
