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R: race Rydberg formula

By Christopher Morris (eds)
From Dictionary of Energy

race radium

race

Hydropower. 1. a channel that conducts water from upstream to the place where it performs work (headrace), or away from that site downstream (tailrace). 2. a very rapid current, or the narrow channel through which it flows.

rack railway

Transportation. a railway used for additional traction in mountain regions, having an intermediate cogged rail set between the running rails that engages with cogwheels on the locomotive.

rad

Nuclear. a measure of the amount of energy absorbed from ionizing radiation, equal to 100 ergs per gram or 0.01 joules per kilogram of irradiated material; it has been replaced as a standard scientific unit by the gray.

radar

Communication. a system that uses reflected electromagnetic radiation to determine the velocity and location of a targeted object; widely used in such applications as aircraft and ship navigation, military reconnaissance, automobile speed checks, and weather observations. [An acronym for radio detection and ranging.]

radial

Electricity. 1. an electric transmission or distribution system that is not networked and does not provide sources of power. 2. see RADIAL TIRE.

radial engine

Transportation. an internal-combustion engine in which the cylinders are arranged like spokes of a wheel at regular intervals around the crankshaft; used formerly as an air-cooled aircraft engine.

radial tire

Transportation. an automotive tire whose cords run across its width, with an extra layer of fabric laid...

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