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surface chemistry

(Encyclopedia)surface chemistry, study of chemical reactions in which the reactants are first adsorbed onto a surface medium (see adsorption) that then acts as a catalyst for the reaction; after the reaction the pr...

spectroscope

(Encyclopedia)spectroscope, optical instrument for producing spectral lines and measuring their wavelengths and intensities, used in spectral analysis (see spectrum). When a material is heated to incandescence it e...

Charles II, king of England, Scotland, and Ireland

(Encyclopedia)Charles II, 1630–85, king of England, Scotland, and Ireland (1660–85), eldest surviving son of Charles I and Henrietta Maria. Charles was a ruler of considerable political skill. His reign was m...

nationalism

(Encyclopedia)nationalism, political or social philosophy in which the welfare of the nation-state as an entity is considered paramount. Nationalism is basically a collective state of mind or consciousness in which...

aerodynamics

(Encyclopedia)aerodynamics, study of gases in motion. As the principal application of aerodynamics is the design of aircraft, air is the gas with which the science is most concerned. Although aerodynamics is primar...

Logos

(Encyclopedia)Logos lōˈgŏs [key] [Gr.,=word], in Greek and Hebrew metaphysics, the unifying principle of the world. The central idea of the Logos is that it links God and man, hence any system in which the Logos...

electors

(Encyclopedia)electors, in the history of the Holy Roman Empire, the princes who had the right to elect the German kings or, more exactly, the kings of the Romans (Holy Roman emperors). Until the reign (1493–1519...

teleportation, in physics

(Encyclopedia)teleportation, in physics, the transfer of key properties from one particle (or group of particles) to another a significant distance apart without a physical connection between the two particles (or ...

scanning tunneling microscope

(Encyclopedia)scanning tunneling microscope (STM), device for studying and imaging individual atoms on the surfaces of materials. The instrument was invented in the early 1980s by Gerd Binnig and Heinrich Rohrer, w...

separator, cream

(Encyclopedia)separator, cream, dairy machine used to separate fresh whole milk into cream and skim milk. Formerly the separation was made by the gravity method, allowing the cream to rise to the top of a pan and t...