air shrinkage
91Crystal oscillator — A miniature 4 MHz quartz crystal enclosed in a hermetically sealed HC 49/US package, used as the resonator in a crystal oscillator. A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal …
92Aerogel — is a low density solid state material derived from gel in which the liquid component of the gel has been replaced with gas. The result is an extremely low density solid with several remarkable properties, most notably its effectiveness as a… …
93Fly ash — Photomicrograph made with a Scanning Electron Microscope (SEM): Fly ash particles at 2,000x magnification Fly ash is one of the residues generated in combustion, and comprises the fine particles that rise with the flue gases. Ash which does not… …
94Tracing paper — is a type of translucent paper. It is made by immersing unsized and unloaded paper of good quality in sulfuric acid for a few seconds. The acid converts some of the cellulose into amyloid form having a gelatinous and impermeable character. When… …
95Uranium mining — The Ranger Uranium Mine in Australia …
96hyperbaric chamber — a steel vessel in which atmospheric pressure can be raised or lowered by air compressors, used to treat divers or pilots afflicted with aeroembolism and to provide high oxygen environments for certain medical treatments and operations. Also… …
97mass transit — a system of large scale public transportation in a given metropolitan area, typically comprising buses, subways, and elevated trains. Cf. rapid transit. * * * Transportation systems, usually publicly but sometimes privately owned and operated,… …
98Syria — /sear ee euh/, n. 1. Official name, Syrian Arab Republic. a republic in SW Asia at the E end of the Mediterranean. 16,137,899; 71,227 sq. mi. (184,478 sq. km). Cap.: Damascus. 2. a territory mandated to France in 1922, including the present… …
99Chad Basin — The Chad Basin, also known as the Lake Chad Basin, is a large lowland area in north central Africa. In all directions from the center of this area the elevation changes are gentle. The Chad Basin is an endorheic (closed) basin its water does not… …
100Gel — For other uses, see Gel (disambiguation). An upturned vial of hair gel A gel (from the lat. gelu freezing, cold, ice or gelatus frozen, immobile) is a solid, jelly like material that can have properties ranging from soft and weak to hard and… …
