Louis Philibert Claude James Chappuis (born 10 November 1854 in Besançon; died 29 January 1934 in Paris) was a French chemist and physicist.
[1] He enrolled in the École normale supérieure (ENS) in Paris in 1874,[2] then worked as a physics teacher at Montauban in 1877, and at Poitiers in 1878.
[3] In 1881, he was appointed as Professor of Physics at the École centrale des arts et manufactures, and attained the doctoral degree in 1882 with a thesis on the spectroscopy of ozone.
[8] In 1882, Paul Hautefeuille and Chappuis published the results of laboratory experiments showing that ozone could be purified and condensed to a deep blue liquid at temperatures under -112 degrees Celsius.
[8] The French meteorologist Jean Dubois proposed in 1951, that the Earth's shadow on the horizon could also be explained by Chappuis absorption, but this hypothesis was later disproven.