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diffusion

(Encyclopedia)diffusion, in chemistry, the spontaneous migration of substances from regions where their concentration is high to regions where their concentration is low. Diffusion is important in many life process...

conduction

(Encyclopedia)conduction, transfer of heat or electricity through a substance, resulting from a difference in temperature between different parts of the substance, in the case of heat, or from a difference in elect...

ignition

(Encyclopedia)CE5 Ignition system ignition, apparatus for igniting a combustible mixture. The German engineer Nikolaus A. Otto, in his first gas engine, used flame ignition; another method was heating a metal t...

French Guiana

(Encyclopedia)CE5 French Guiana gēănˈə, –änˈ– [key], Fr. La Guyane française, officially Department of Guiana, French overseas department (2015 est. pop. 269,000), 35,135 sq mi (91,000 sq km), NE Sout...

friction

(Encyclopedia)friction, resistance offered to the movement of one body past another body with which it is in contact. In certain situations friction is desired. Without friction the wheels of a locomotive could not...

methadone

(Encyclopedia)methadone mĕthˈədōnˌ, –dŏnˌ [key], synthetic narcotic similar in effect to morphine. Synthesized in Germany, it came into clinical use after World War II. It is sometimes used as an analgesic...

wages

(Encyclopedia)wages, payment received by an employee in exchange for labor. It may be in goods or services but is customarily in money. The term in a broad sense refers to what is received in any way for labor, but...

compression

(Encyclopedia)compression, external stress applied to an object or substance, tending to cause a decrease in volume (see pressure). Gases can be compressed easily, solids and liquids to a very small degree if at al...

condensation

(Encyclopedia)condensation, in physics, change of a substance from the gaseous (vapor) to the liquid state (see states of matter). Condensation is the reverse of vaporization, or change from liquid to gas. It can b...

Nenets Autonomous Area

(Encyclopedia)Nenets Autonomous Area nyĕˈnyĭts [key], administrative division (1990 est. pop. 55,000), 68,224 sq mi (176,700 sq km), extreme NE European Russia. Formed in 1929, the area forms the northern part o...