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Bulgaria

(Encyclopedia)CE5 Bulgaria bŭlgârˈēə [key], Bulgarian Balgarija, officially Republic of Bulgaria, r...

atom

(Encyclopedia)CE5 Bohr-Rutherford atom CE5 Probability distribution of the electron in the hydrogen atom: A. Ground state B. Highly excited state atom [Gr.,=uncuttable (indivisible)], basic unit of matte...

Mongolia, country, Asia

(Encyclopedia)CE5 Mongolia mŏn-gōˈlēə, mŏng– [key], republic (2015 est. pop. 2,977,000), 604,247 sq mi (1,565,000 sq km), N central Asia; historically known as Outer Mongolia. Bordered on the west, south...

Estonia

(Encyclopedia)CE5 Estonia ĕstōˈnēə [key], Estonian Eesti, officially Republic of Estonia, republic ...

El Salvador

(Encyclopedia)CE5 El Salvador ĕl sälväᵺōrˈ [key], officially Republic of El Salvador, republic (2021 est. pop. ...

Rhode Island, state, United States

(Encyclopedia)CE5 Rhode Island, smallest state in the United States, located in New England; bounded by Massachusetts (N and E), the Atlantic Ocean (S), and Connecticut (W). Until well into the 20th cent. ...

Berlin, city, Germany

(Encyclopedia)Berlin bûrˌlĭnˈ, Ger. bĕrlēnˈ [key], city (2021 est. pop. 3,567,000), capital ...

Latvia

(Encyclopedia)CE5 Latvia lătˈvēə [key], Latvian Latvija, officially Republic of Latvia, republic (2015 est. pop. 1,993,000), 24,590 sq mi (63,688 sq km), north central Europe. It borders on Estonia in the no...

Montana

(Encyclopedia)CE5 Montana mŏntănˈə [key], Rocky Mt. state in the NW United States. It is bounded by North Dakota and South Dakota (E), Wyoming (S), Idaho (W), and the Canadian provinces of British Columbia, ...

internal-combustion engine

(Encyclopedia)CE5 Internal-combustion engines: In the four-stroke reciprocating engine (above), a mixture of fuel and air is taken into the chamber on the down-stroke of the piston, is compressed on the up-strok...