(Encyclopedia) space-time, central concept in the theory of relativity that replaces the earlier concepts of space and time as separate absolute entities. In relativity one cannot uniquely…
(Encyclopedia) Erdös, PaulErdös, Paulĕrˈdös [key], 1913–96, Hungarian mathematician, b. Budapest. A child prodigy, he was mostly home-schooled by his parents—both teachers of mathematics—until he…
(Encyclopedia) gas, in physics, one of the three commonly recognized states of matter, the other two being solid and liquid. A substance in the gaseous state has neither definite shape nor definite…
(Encyclopedia) anaplasmosisanaplasmosisănˌəplăzmōˈsĭs [key], infectious blood disease in cattle, sheep, and goats, caused by a rickettsia of the genus Anaplasma. The organism parasitizes red blood…
(Encyclopedia) Goncourt, Edmond Louis Antoine Huot deGoncourt, Edmond Louis Antoine Huot deĕdmôNˈ lwē äNtwänˈ üōˈ də gôNk&oomacr;rˈ [key], 1822–96, and Jules Alfred Huot de GoncourtGoncourt,…
(Encyclopedia) Habré, HissèneHabré, Hissènehēsĕnˈ häbrāˈ [key], 1942–, Chadian political leader, president of Chad (1982–90). He studied political science in Paris during the late 1960s and,…
(Encyclopedia) Frederick VI, 1768–1839, king of Denmark (1808–39) and Norway (1808–14), son and successor of Christian VII. After the court party had executed Struensee, expelled Frederick's mother,…
(Encyclopedia) photometryphotometryfōtŏmˈətrē [key], branch of physics dealing with the measurement of the intensity of a source of light, such as an electric lamp, and with the intensity of light…
(Encyclopedia) molecular weight, weight of a molecule of a substance expressed in atomic mass units (amu). The molecular weight may be calculated from the molecular formula of the substance; it is…
(Encyclopedia) cabinet, group of advisers to the head of the state who themselves are usually the heads of the administrative government departments. The nature of the cabinet differs widely in…
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