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deliquescence

(Encyclopedia)deliquescence dĕlˌəkwĕsˈəns [key], conversion of a solid substance into a liquid as a result of absorption of water vapor from the air. Since impurities in a solid lower its melting point, the a...

projective geometry

(Encyclopedia)projective geometry, branch of geometry concerned with those properties of geometric figures that remain invariant under projection. The basic elements are points, lines, and planes, and the following...

map projection

(Encyclopedia)map projection, transfer of the features of the surface of the earth or another spherical body onto a flat sheet of paper. Only a globe can represent accurately the shape, orientation, and relative ar...

titration

(Encyclopedia)titration tītrāˈshən [key], gradual addition of an acidic solution to a basic solution or vice versa (see acids and bases); titrations are used to determine the concentration of acids or bases in ...

Cullum, George Washington

(Encyclopedia)Cullum, George Washington kŭlˈəm [key], 1809–92, American army officer, b. New York City, grad. West Point, 1833. In the Civil War, Cullum was made a brigadier general of volunteers (Nov., 1861) ...

Denver

(Encyclopedia)Denver, city (2020 pop. 715,522), alt. 5,280 ft (1,609 m), state capital, coextensive with Denver co., N central Colo., on a plateau at the foot of the ...

apsis

(Encyclopedia)CE5 Apsis points, or apsides, in the earth's orbit: At perihelion the earth is closest to the sun and at aphelion it is farthest from the sun. apsis (pl. apsides), point in the orbit of a body whe...

fan

(Encyclopedia)fan, device for agitating air or gases or moving them from one location to another. Mechanical fans with revolving blades are used for ventilation, in manufacturing, in winnowing grain, to remove dust...

aurora borealis

(Encyclopedia)aurora borealis ôstrāˈlĭs [key], luminous display of various forms and colors seen in the night sky. The aurora borealis of the Northern Hemisphere is often called the northern lights, and the aur...

Maccabees, books of the Bible

(Encyclopedia)Maccabees, two books included in the Septuagint and placed as the last two books in the Old Testament of the Vulgate; they are not included in the Hebrew Bible and are placed in the Apocrypha in Prote...