Ammonium nitrate can absorb enough moisture to liquefy. The acetone condenses evenly all over the part, causing the surface to soften and liquefy. This rapidly cools the air, and the various constituents quickly liquefy. After compression it flows to the liquefiers, where it is cooled enough to liquefy. These enzymes cause the neural tissue to become soft and liquefy. Heike Kamerlingh Onnes took on the challenge to liquefy the remaining gases, hydrogen and helium. It produces a reduction of litmus milk, but does not liquefy gelatin. Denufosol, an investigational drug, opens an alternative chloride channel, helping to liquefy mucus. Ejaculate is jellylike and fails to liquefy. The Siemens cycle is a technique used to cool or liquefy gases. However, some gases can liquefy under high pressure, leading to an abrupt loss of buoyancy. During that time there were efforts to liquefy gases. Energy is used to liquefy air, and then LN2 is produced by evaporation, and distributed. This mysterious metal had the ability to produce vibrations which would liquefy all other metals. These types of honey enter a gel-like state when motionless, but liquefy when stirred.