Simon liquefier

Simon liquefier

[¦sī·mən ′lik·wə‚fī·ər]
(cryogenics)
A device for liquefying helium in which helium is first cooled at high pressure by liquid or solid hydrogen and is then liquefied by a single adiabatic expansion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.