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Unformatted text preview: Appendix A / The International System of Units (SI) nits in the International System of Units fall into two classiﬁcations: base and derived. Base units are fundamental and not reducible. Table A.1 lists the base units of interest in the discipline of materials science and engineering. Derived units are expressed in terms of the base units, using mathematical signs for multiplication and division. For example, the SI units for density are kilogram per cubic meter (kg/m3). For some derived units, special names and symbols exist; for example, N is used to denote the newton, the unit of force, which is equivalent to 1 kg-m/s2. Table A.2 contains a number of the important derived units. It is sometimes necessary, or convenient, to form names and symbols that are decimal multiples or submultiples of SI units. Only one preﬁx is used when a multiple of an SI unit is formed, which should be in the numerator. These preﬁxes and their approved symbols are given in Table A.3. Symbols for all units used in this book, SI or otherwise, are contained inside the front cover. U Table A.1 The SI Base Units
Quantity Length Mass Time Electric current Thermodynamic temperature Amount of substance Name meter, metre kilogram second ampere kelvin mole Symbol m kg s A K mol 439 ...
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This note was uploaded on 11/04/2010 for the course ACC 411 taught by Professor Kim during the Spring '08 term at Aberystwyth University.
- Spring '08