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stereochemistry

(Encyclopedia)stereochemistry, study of the three-dimensional configuration of the atoms that make up a molecule and the ways in which this arrangement affects the physical and chemical properties of the molecule. ...

thallium

(Encyclopedia)thallium thălˈēəm [key], metallic chemical element; symbol Tl; at. no. 81; interval in which at. wt. ranges 204.382–204.385; m.p. 303.5℃; b.p. about 1,457℃; sp. gr. 11.85 at 20℃; valence +...

Della Robbia

(Encyclopedia)Della Robbia dĕlˌə rŏbˈēə, Ital. dĕlˈlä rôbˈbyä [key], Florentine family of sculptors and ceramists famous for their enameled terra-cotta or faience. Many of the Della Robbia pieces are s...

fermium

(Encyclopedia)fermium fûrˈmēəm [key] [for Enrico Fermi], artificially produced radioactive chemical element; symbol Fm; at. no. 100; mass no. of most stable isotope 257; m.p. 1,527℃; b.p. and sp. gr. unknown;...

Boksburg

(Encyclopedia)Boksburg bŏksˈbûrgˌ [key], city, now part of Ekurhuleni metropolitan municipality, Gauteng prov., NE South Africa. It is an important coal-mining center. Some gold mining is still carried on. Manu...

Paralympic games

(Encyclopedia)Paralympic games, series of international sports contests for athletes with physical, visual, and intellectual impairments. The games grew out of a gathering of British World War II veterans organized...

Terminus

(Encyclopedia)Terminus tûrˈmĭnəs [key], in ancient Rome, both the boundary markers between properties and the name of the god who watched over boundaries. Property lines were of great importance, particularly t...

cloud

(Encyclopedia)CE5 Approximate heights of some types of clouds cloud, aggregation of minute particles of water or ice suspended in the air. Cloudiness (or proportion of the sky covered by any form of cloud),...

reservoir

(Encyclopedia)reservoir rĕzˈəvôr, –vwär [key], storage tank or wholly or partly artificial lake for storing water. Building an embankment or dam to preserve a supply of water for irrigation is an ancient pra...

annealing

(Encyclopedia)annealing ənēlˈĭng [key], process in which glass, metals, and other materials are treated to render them less brittle and more workable. Annealing consists of heating the material and then cooling...