| February 12th |
| 1785 | Pierre L. DuLong, who discovered nitrogen trichloride, was born. He was a researcher on refractive indeces and specific heats of gases; Law of constancy of atomic heat (DuLong and Petit). He suggested that acids were compounds of hydrogen and devised a formula for heat value of fuels (DuLong Formula). |
| 1777 | French chemist Bernard Courtois was born. |