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hydrogen chloride

(Encyclopedia)hydrogen chloride, chemical compound, HCl, a colorless, poisonous gas with an unpleasant, acrid odor. It is very soluble in water and readily soluble in alcohol and ether. It fumes in moist air. It is...

hysteresis

(Encyclopedia)hysteresis hĭsˌtərēˈsĭs [key], phenomenon in which the response of a physical system to an external influence depends not only on the present magnitude of that influence but also on the previous...

field, in physics

(Encyclopedia)field, in physics, region throughout which a force may be exerted; examples are the gravitational, electric, and magnetic fields that surround, respectively, masses, electric charges, and magnets. The...

Eve, in genetics

(Encyclopedia)Eve, in genetics, popular term for a theoretical female ancestor of all living people, also known as Mitochondrial Eve. In 1987 biochemist Allan C. Wilson proposed that all living human beings had inh...

Planck, Max

(Encyclopedia)Planck, Max mäks plängk [key], 1858–1947, German physicist. Seeking to explain the experimental spectrum (distribution of electromagnetic energy according to wavelength) of blackbody radiation, he...

Thomas, Norman Mattoon

(Encyclopedia)Thomas, Norman Mattoon, 1884–1968, American socialist leader, b. Marion, Ohio; grad. Princeton (1905), Union Theological Seminary (1911). He served as pastor of several Presbyterian churches and did...

Sunni

(Encyclopedia)Sunni so͞oˈnī [key] [Arab. Sunna,=tradition], from ahl al-sunnah wa-l-jamaa [Arab.,=the people of the custom of the Prophet and community], the largest division of Islam. Sunni Islam is the heir to...

Maintenon, Françoise d'Aubigné, marquise de

(Encyclopedia)Maintenon, Françoise d'Aubigné, marquise de fräNswäzˈ dōbēnyāˈ märkēzˈ də măNtənôNˈ [key], 1635–1719, second wife of the French king Louis XIV. Her grandfather was Théodore Agrippa...

Moses

(Encyclopedia)Moses mōˈzĭs [key], Hebrew lawgiver, probably b. Egypt. The prototype of the prophets, he led his people in the 13th cent. b.c. out of bondage in Egypt to the edge of Canaan. The narrative in the B...

Jacobite Church

(Encyclopedia)Jacobite Church jăkˈəbītˌ [key], officially Syrian Orthodox Church, Christian church of Syria, Iraq, and India, recognizing the Syrian Orthodox patriarch of Antioch as its spiritual head, regarde...