<P> He next experimented with a high - pressure hydrogen jet by which low temperatures were realised through the Joule -- Thomson effect , and the successful results he obtained led him to build at the Royal Institution a large regenerative cooling refrigerating machine . Using this machine in 1898 , liquid hydrogen was collected for the first time , solid hydrogen following in 1899 . He tried to liquefy the last remaining gas , helium , which condenses into a liquid at − 268.9 ° C , but owing to a number of factors , including a short supply of helium , Dewar was preceded by Heike Kamerlingh Onnes as the first person to produce liquid helium , in 1908 . Onnes would later be awarded the Nobel Prize in Physics for his research into the properties of matter at low temperatures -- Dewar was nominated several times , but never succeeded in winning the Nobel Prize . </P>
<P> He next experimented with a high - pressure hydrogen jet by which low temperatures were realised through the Joule -- Thomson effect , and the successful results he obtained led him to build at the Royal Institution a large regenerative cooling refrigerating machine . Using this machine in 1898 , liquid hydrogen was collected for the first time , solid hydrogen following in 1899 . He tried to liquefy the last remaining gas , helium , which condenses into a liquid at − 268.9 ° C , but owing to a number of factors , including a short supply of helium , Dewar was preceded by Heike Kamerlingh Onnes as the first person to produce liquid helium , in 1908 . Onnes would later be awarded the Nobel Prize in Physics for his research into the properties of matter at low temperatures -- Dewar was nominated several times , but never succeeded in winning the Nobel Prize . </P>
who has won the race to liquefy helium
who has won the race to liquefy helium
Heike Kamerlingh Onnes
Heike Kamerlingh Onnes