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British thermal unit

(Encyclopedia)British thermal unit, abbr. Btu, unit for measuring heat quantity in the customary system of English units of measurement, equal to the amount of heat required to raise the temperature of one pound of...

nuclear reactor

(Encyclopedia)CE5 Power reactor system nuclear reactor, device for producing controlled release of nuclear energy. Reactors can be used for research or for power production. A research reactor is designed to pr...

Ersch, Johann Samuel

(Encyclopedia)Ersch, Johann Samuel yōˈhän zäˈmo͞oĕl ĕrsh [key], 1766–1828, German encyclopedist, first editor of the great encyclopedia known as Ersch and Gruber's. At his death, 17 volumes had been compl...

Evans, Charles

(Encyclopedia)Evans, Charles, 1850–1935, American librarian and bibliographer, b. Boston. He organized many major American libraries including the Indianapolis public library, the Enoch Pratt Free Library in Balt...

Stirling engine

(Encyclopedia)Stirling engine, an external combustion reciprocating engine having an enclosed working fluid that is alternately compressed and expanded to operate a piston, thus converting heat from a variety of so...

infrared radiation

(Encyclopedia)infrared radiation, electromagnetic radiation having a wavelength in the range from c.75 × 10−6 cm to c.100,000 × 10−6 cm (0.000075–0.1 cm). Infrared rays thus occupy that part of the electrom...

thermal capacity

(Encyclopedia)thermal capacity: see heat capacity. ...

Jenner, Edward

(Encyclopedia)Jenner, Edward, 1749–1823, English physician; pupil of John Hunter. His invaluable experiments beginning in 1796 with the vaccination of eight-year-old James Phipps proved that cowpox provided immun...

Barbier, Antoine Alexandre

(Encyclopedia)Barbier, Antoine Alexandre äNtwänˈ älĕksäNˈdrə bärbyāˈ [key], 1765–1825, French bibliographer and government librarian. Barbier was one of a committee appointed to collect works suppresse...

dew

(Encyclopedia)dew, thin film of water that has condensed on the surface of objects near the ground. Dew forms when radiational cooling of these objects during the nighttime hours also cools the shallow layer of ove...