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carbon dioxide

(Encyclopedia)carbon dioxide, chemical compound, CO2, a colorless, odorless, tasteless gas that is about one and one-half times as dense as air under ordinary conditions of temperature and pressure. It does not bur...

leaven

(Encyclopedia)leaven lĕvˈən [key], agent used to raise bread or other flour foods. Physical leavens include water vapor, which is released as steam at high temperatures (as in popovers), and air, which is incorp...

pelican

(Encyclopedia)pelican, common name for a large, gregarious aquatic bird of warm regions, allied to the cormorants and gannets. Pelicans are heavy-bodied, long-necked birds with large, flat bills. They are graceful ...

alkali metals

(Encyclopedia)alkali metals, metals found in Group 1 of the periodic table. Compared to other metals they are soft and have low melting points and densities. Alkali metals are powerful reducing agents and form univ...

assaying

(Encyclopedia)assaying əsāˈyĭng, ăsˈāyĭng [key], in metallurgy, process of determining the specific metallic content of an ore, alloy, or other substance, especially one containing precious metals. It consi...

Hale, Horatio Emmons

(Encyclopedia)Hale, Horatio Emmons, 1817–96, American-Canadian ethnologist, b. Newport, N.H.; son of Sarah Josepha Hale. He served as ethnologist on the Charles Wilkes exploring expedition (1838–42) and wrote V...

hibernation

(Encyclopedia)hibernation hīˌbərnāˈshən [key] [Lat.,= wintering], practice, among certain animals, of spending part of the cold season in a more or less dormant state, apparently as protection from cold when ...

transpiration

(Encyclopedia)transpiration, in botany, the loss of water by evaporation in terrestrial plants. Some evaporation occurs directly through the exposed walls of surface cells, but the greatest amount takes place throu...

Chicopee

(Encyclopedia)Chicopee chĭkˈəpē [key], city (2020 pop. 54,530), Hampden co., SW Mass., at the confluence ...

methane

(Encyclopedia)methane mĕthˈān [key], CH4, colorless, odorless, gaseous saturated hydrocarbon; the simplest alkane. It is less dense than air, melts at −184℃, and boils at −161.4℃. It is combustible and c...