The International System of Measurements SI

The International System of Measurement (SI for Systeme International d Unith), a modern elaboration of the original metric system, was set up in I960. It was developed to provide a very organized, precise, and practical system of measurement that everyone in the world could use. The SI system is constructed using seven base units, from which all other units are derived (Table 1.1). The chemist is not usually interested in electric currents or luminous intensity, so only the first five of the base units on Table 1.1 will appear in this text. The meaning of mole, the base unit for amount of substance, is explained in Chapter 9. Until then, we will use the first four base units meter (m), kilogram (kg), second (s), and kelvin (K). 

Use the International System of Measurements (SI) base units and their abbreviations to describe length, mass, time, temperature, and volume. 

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