Liquid oxygen

Progress in the liquefaction of gases led to cooling oxygen and other gases to extreme temperatures, creating liquid oxygen. This discovery enabled advancements in physics and chemistry related to gas properties and behaviors.
 Louis-Paul Cailletet and Raoul-Pierre Pictet France 1877 Liquid oxygen

Progress in the liquefaction of gases led to cooling oxygen and other gases to extreme temperatures, creating liquid oxygen. This discovery enabled advancements in physics and chemistry related to gas properties and behaviors.