Si, river, China

Si, river, China: see Xi Xi or Xi Jiang , great river of S China, c.1,250 mi (2,010 km) long, rising in E Yunnan prov. and flowing generally E through Guangxi and Guangdong provs.
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Si, chemical symbol

Si, symbol for the element silicon silicon, nonmetallic chemical element; symbol Si; at. no. 14; at. wt. 28.0855; m.p. 1,410°C;; b.p. 2,355°C;; sp. gr. 2.33 at 25°C;; valence usually +4. Silicon is the element directly below carbon and above germanium in Group 14 of the periodic table.
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SI, abbreviation for the International System of Units

SI: see International System of Units International System of Units, officially called the Système International d'Unités, or SI, system of units adopted by the 11th General Conference on Weights and Measures (1960). It is based on the metric system.
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See systems integrator, SI units and silicon.

Xi, Hsi, Si

a river in S China, rising in Y?nnan province and flowing east to the Canton delta on the South China Sea: the main river system of S China. Length: about 1900 km (1200 miles)

(chemistry)

silicon

(physics)

International System of Units

International System of Units (SI)

A system of units based on the following fundamental quantities: metre, kilogram, second, ampere, kelvin, candela, and mole.

The symbol for the International System of Units.

1.	(unit)	SI - Système International.
2.	(character)	SI - Shift In.
3.	(networking)	si - The country code for Slovenia.

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Si, river, China

Si, chemical symbol

SI, abbreviation for the International System of Units

Si