Louis Paul Cailletet

LouisPaul Cailletet was a French physicist and inventor.

Cailletet was born in ChtillonsurSeine, CtedOr. Educated in Paris, Cailletet returned to Chtillon to manage his fathers ironworks. In an effort to determine the cause of accidents that occurred while tempering incompletely forged iron, Cailletet found that heating the iron put it in a highly unstable state, with gases dissolved in it. He then analyzed the gases from blast furnaces, which helped him understand the role of heat in the changes of states of metals. This brought him to the work of liquefying the various gases.

Source: Wikipedia