General science

General science

A variety of science subjects concerning the fundamental knowledge about different aspects of our world and their underlying principles.

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General science

One of a class of organic compounds characterised by the structural feature of an oxygen atom linking two hydrocarbon groups, R–O–R′. Ethers are used widely as solvents, both in chemical manufacture ...

Polymer recycling and degradation

Science; General science

Polymers are used in numerous applications because of their low weight, high adaptability, and ease of processing. The use of low-weight plastics as packaging material and as a replacement for metal ...

Petrifaction

Science; General science

One of the most remarkable mechanisms by which the remains of extinct organisms are preserved in the fossil record. In petrifactions (though chiefly in the case of plants rather than animals) the ...

Pyrotechnics

Science; General science

Mixtures of substances that produce noise, light, heat, smoke, or motion when ignited. They are used in matches, incendiaries, and other igniters; in fireworks and flares; in fuses and other ...

Energy

Science; General science

One of the two fundamental constituents of the universe, interconvertible with the other constituent, matter. All physical processes involve exchange of energy, or conversion from one of its named ...

Surveying instruments

Science; General science

Instruments used in surveying operations to measure vertical angles, horizontal angles, and distance. The devices used for these measurements were originally mechanical only, but advances in the ...

Celestial navigation

Science; General science

Navigation with the aid of celestial bodies, primarily for determination of position when landmarks are not available. In celestial navigation, position is not determined relative to the objects ...