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Le Châtelier's principle

(Encyclopedia)Le Châtelier's principle, chemical principle that states that if a system in equilibrium is disturbed by changes in determining factors, such as temperature, pressure, and concentration of components...

North America

(Encyclopedia)CE5 North America, third largest continent (2015 est. pop. 571,949,000), c.9,400,000 sq mi (24,346,000 sq km), the northern of the two continents of the Western Hemisphere. North America includes a...

fluidics

(Encyclopedia)fluidics, branch of engineering and technology concerned with the development of equivalents of various electronic circuits using movements of fluid rather than movements of electric charge. The basic...

Robbins, Lionel Charles

(Encyclopedia)Robbins, Lionel Charles, 1898–1984, British economist, b. Middlesex, England. A professor at the London School of Economics (1929–61), he wrote the well-known methodological treatise, An Essay in ...

axiom

(Encyclopedia)axiom, in mathematics and logic, general statement accepted without proof as the basis for logically deducing other statements (theorems). Examples of axioms used widely in mathematics are those relat...

liquor laws

(Encyclopedia)liquor laws, legislation designed to restrict, regulate, or totally abolish the manufacture, sale, and use of alcoholic beverages. The passage of liquor laws has been prompted chiefly by the desire to...

socialized medicine

(Encyclopedia)socialized medicine, publicly administered system of national health care. The term is used to describe programs that range from government operation of medical facilities to national health-insurance...

plumbing

(Encyclopedia)plumbing, piping systems inside buildings for water supply and sewage. The Romans had a highly developed plumbing system; water was brought to Rome by aqueducts and distributed to homes in lead pipesâ...

English units of measurement

(Encyclopedia)English units of measurement, principal system of weights and measures used in a few nations, the only major industrial one being the United States. It actually consists of two related systems—the U...

Philadelphia, city, United States

(Encyclopedia)Philadelphia, city (2020 pop. 1,603,797), coextensive with Philadelphia co., SE Pa., on the Delaware River c.100 mi (160 km) upstream at the influx of t...