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hardness

(Encyclopedia)hardness, property of matter commonly described as the resistance of a substance to being scratched by another substance. The degree of hardness is relative, different substances being compared with o...

formaldehyde

(Encyclopedia)formaldehyde fôrmălˈdəhīdˌ [key], HCHO, the simplest aldehyde. It melts at −92℃, boils at −21℃, and is soluble in water, alcohol, and ether; at STP, it is a flammable, poisonous, colorle...

logic circuit

(Encyclopedia)logic circuit, electric circuit whose output depends upon the input in a way that can be expressed as a function in symbolic logic; it has one or more binary inputs (capable of assuming either of two ...

Massys, Quentin

(Encyclopedia)Massys, Matsys, Messys, or Metsys, Quentin kvĕnˈtĭn mäsīsˈ, mätsīsˈ, mĕ–, mĕt– [key], c.1466–1530, Flemish painter. After studying in Louvain, he moved to Antwerp by 1491, remaining i...

polyhedron

(Encyclopedia)CE5 Polyhedrons polyhedron pŏlˌēhēˈdrən [key], closed solid bounded by plane faces; each face of a polyhedron is a polygon. A cube is a polyhedron bounded by six polygons (in this case squar...

Villard, Henry

(Encyclopedia)Villard, Henry vĭlärdˈ [key], 1835–1900, American journalist and financier, b. Germany. His first name was originally Hilgard. He attended universities in Germany, and after he reached (1853) the...

sucrose

(Encyclopedia)sucrose so͞oˈkrōs [key], commonest of the sugars, a white, crystalline solid disaccharide (see carbohydrate) with a sweet taste, melting and decomposing at 186℃ to form caramel. It is known commo...

picric acid

(Encyclopedia)picric acid trīˌnīˌtrōfēˈnōl [key], C6H2(NO2)3OH, a toxic yellow crystalline solid that melts at 122℃ and is soluble in most organic solvents. Picric acid is a derivative of phenol. It react...

Bardeen, John

(Encyclopedia)Bardeen, John bärdēnˈ [key], 1908–91, American physicist, b. Madison, Wis., grad. Univ. of Wisconsin (B.S. 1928, M.S. 1929), Ph.D. Princeton, 1936. He was a research physicist at the Bell Telepho...

sea slug

(Encyclopedia)sea slug, name for a marine gastropod mollusk that lacks a shell as an adult and is usually brightly colored. Sea slugs, or nudibranchs, are distributed throughout the world, with the greatest numbers...