Louis Paul Cailletet
Louis-Paul Cailletet was born in Chatillon-sur-Seine,
France in
1832. He was a
physicist and inventor and succeeded in producing droplets of liquid
oxygen in
1877 but by a different method from that used by
Raoul Pictet. He used the
Joule-Thomson effect. The oxygen was compressed whilst being cooled. The compressed gas was then allowed to expand rapidly, cooling it even more. The result was the production of small droplets of liquid oxygen. Cailletet died in
1913.