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British chemist and physicist who in 1766 discovered hydrogen, which he called "inflammable air." He also demonstrated that it is the lightest of all the gases and established that water is a compound of hydrogen and oxygen. In 1798, Cavendish estimated with great accuracy the mean density of the Earth.
unincorporated rural community, Queens county, on the central northern coast of Prince Edward Island, Canada, 24 miles (39 km) northwest of Charlottetown. It lies near a sandy beach (called Penamkeak by the Micmac Indians and now a popular bathing place) at the western end of Prince Edward Island National Park (q.v.). Probably named about 1772 for Field Marshal Lord Frederick Cavendish, the place was used by Lucy Maud Montgomery as the setting (Avonlea) for her novel Anne of Green Gables (1908) and its sequels. The Green Gables farmhouse (her girlhood home) is a tourist attraction, and Montgomery is buried nearby. Summer tourism is the basic economic activity. Pop. (2006) 272.