Gay-Lus·sac  (gā'lə-sāk', -lü-säk')  French chemist and physicist who isolated the element boron (1809) and formulated a law that explains the behavior of a gas under constant pressure. |
| Gay-Lussac (gā'lə-sāk') Pronunciation Key
French chemist and physicist who in 1808 developed a law governing the ratio of volumes of gases participating in chemical reactions. In that same year, with Louis Jacques Thénard, he discovered the element boron. |