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kilogram

(Encyclopedia)kilogram, abbr. kg, fundamental unit of mass in the metric system, defined as the mass of the International Prototype Kilogram, a platinum-iridium cylinder kept at Sèvres, France, near Paris. Copies ...

heat

(Encyclopedia)heat, nonmechanical energy in transit, associated with differences in temperature between a system and its surroundings or between parts of the same system. The study of heat and its relationship ...

Polish Corridor

(Encyclopedia)Polish Corridor, strip of German territory awarded to newly independent Poland by the Treaty of Versailles in 1919. The strip, 20 to 70 mi (32–112 km) wide, gave Poland access to the Baltic Sea. It ...

parcel post

(Encyclopedia)parcel post, sending of packages through the mail service. At the congress of the Universal Postal Union in Paris in 1878, an international parcel-post system was established. The British parcel-post ...

Ternate

(Encyclopedia)Ternate tĕrnäˈtā [key], volcanic island (c.40 sq mi/100 sq km), E Indonesia, in the Molucca Sea, one of the Moluccas. Forested and mountainous, the nearly conical Ternate rises to the summit of Ga...

pound

(Encyclopedia)pound, abbr. lb, unit of either mass or force in the customary system of English units of measurement. Two different pounds of mass are defined, one in the avoirdupois system of units and one in the T...

Lyon, Mary

(Encyclopedia)Lyon, Mary līˈən [key], 1797–1849, American educator, founder of Mt. Holyoke College, b. Buckland, Mass. She attended three academies in Massachusetts; later she taught at Ashfield, Mass., London...

Constanţa

(Encyclopedia)Constanţa kônstänˈtsä [key], city, SE Romania, on the Black Sea. It is the administrative center ...

Vyborg

(Encyclopedia)Vyborg vĭˈbərk [key], Finnish Viipuri, Swed. Viborg, city (1989 pop. 81,000), NW European Russia, NW of St. Petersburg and near the Finnish border, on Vyborg Bay and the Gulf of Finland. A Baltic p...

nucleus, in physics

(Encyclopedia)nucleus, in physics, the extremely dense central core of an atom. Following the discovery of radioactivity by A. H. Becquerel in 1896, Ernest Rutherford identified two types of radiation given off b...