http://hyperphysics.phy-astr.gsu.edu/hbase/lhel.html#c3 Liquid Helium Onnes's liquifaction of helium 오네스의 헬륨 액화 Onnesovo ukapljevinjenje helija أونز في تسييل (جعلة سائل) الهيليوم Pencecairan helium oleh Onnes Onnes's liquifaction of helium "Liquid Helium Working Range" Onnes's liquifaction of helium Liquid Helium Working Range أونز في تسييل (جعلة سائل) الهيليوم worked Liquid helium, superfluidity Onnes's liquifaction of helium Pencecairan helium oleh Onnes worked 오네스의 헬륨 액화 Onnes's liquifaction of helium Liquid Helium Liquid Helium Onnes's liquifaction of helium Liquid Helium Working Range Onnesovo ukapljevinjenje helija Onnes's liquifaction of helium Liquid Helium http://hyperphysics.phy-astr.gsu.edu/hbase/lhel.html#c3