Chapter 1 Measurement
Chapter 1 Measurement
Despite the mathematical beauty of some of its most complex and abstract theories physics is above all an experimental science
Despite the mathematical beauty of some of its most complex and abstract theories, physics is above all an experimental science
1-1 Physical quantities, standards and units What will be measured? Physical quantities: mass, length, time, force What's the standard for a measurement? Maintaining and developing standards is an active branch of science Units There are seven kinds of base units in SI system
1-1 Physical quantities, standards and units • What will be measured? Physical quantities: mass, length, time, force… • What’s the standard for a measurement? Maintaining and developing standards is an active branch of science. • Units There are seven kinds of base units in SI system
-2 The international system of units cGPM(国际度量衡大会) selected as base units the seven quantities displayed in Table 1-1. This is the basis of the International System of Units abbreviated sl
1-2 The international system of units CGPM(国际度量衡大会) selected as base units the seven quantities displayed in Table 1-1. This is the basis of the International System of Units, abbreviated SI
Table 1-1 SI Base units Quantity Name Symbol Time Second Length Meter Mass Kilogram Kg Amount of Mole Mol substance Temperature Kelvin Electric current Ampere K—A Luminous intensity Candela cd
Table 1-1 SI Base units Quantity Name Symbol Time Second s Length Meter m Mass Kilogram Kg Amount of substance Mole Mol Temperature Kelvin K Electric current Ampere A Luminous intensity Candela cd