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palladium, chemical element

(Encyclopedia)palladium [Gr. Pallas, goddess of wisdom], metallic chemical element; symbol Pd; at. no. 46; at. wt. 106.42; m.p. 1,554℃; b.p. 2,970℃; sp. gr. 12.02 at 20℃; valence +2, +3, or +4. Palladium is a...

nitric acid

(Encyclopedia)nitric acid, chemical compound, HNO3, colorless, highly corrosive, poisonous liquid that gives off choking red or yellow fumes in moist air. It is miscible with water in all proportions. It forms an a...

solid

(Encyclopedia)solid, one of the three commonly recognized states in which matter occurs, i.e., that state, as distinguished from liquid and gas, in which a substance has both a definite shape and a definite volume....

Yokohama

(Encyclopedia)Yokohama yōˌkōhäˈmä [key], city (1990 pop. 3,220,331), capital of Kanagawa prefecture, SE Honshu, Japan, on the western shore of Tokyo Bay. Japan's second largest city and one of its leading sea...

caravan

(Encyclopedia)caravan, group of travelers or merchants banded together and organized for mutual assistance and defense while traveling through unsettled or hostile country. Caravan trade is associated with the hist...

milling

(Encyclopedia)milling, mechanical grinding of wheat or other grains to produce flour. Milling separates the fine, mealy parts of grain from the fibrous bran covering. In prehistoric times grain was crushed between ...

commodity market

(Encyclopedia)commodity market, organized traders' exchange in which standardized, graded products are bought and sold. Worldwide, there are more than 20 major commodity exchanges and many smaller ones that trade c...

El Paso

(Encyclopedia)El Paso ĕl păˈsō [key], city (2020 pop. 678,815), seat of El Paso co., extreme W Tex., on ...

promethium

(Encyclopedia)promethium prōmēˈthēəm [key], artificially produced radioactive chemical element; symbol Pm; at. no. 61; mass no. of most stable isotope 145; m.p. 1,042℃; b.p. 3,000℃ (estimated); sp. gr. unk...

3D printer

(Encyclopedia)3D printer, computerized device that produces a three-dimensional object by creating it as a series of thin layers. The object is created from a model stored in computer-aided design file; the model i...