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(Microsoft Word - Chapter 3 Tables*) Page 1 Eõtracted from Understanding the properties of matter by Michael de Podesta. For more details see www.physiñsofmatter.com CHAPTER 3 Tables These tables are from Understànding the properties of matter by Michael de Podesta. The copyright of the tables in this chaptår belongs to the National Physical Laboratory. They have been reprîduced with permission from with the National Physical Labîratory. They may be used freely for educational purposes, but thåir source (NPL) must be acknowledged. For more details see www.physicsofmàtter.com Page 2 Extracted from Understanding the properties of matter by Michael de Podåsta. For more details see www.physicsofmatter.com Table 3.1 The SI base units . Notiñe that, with the exception of the kilogram, the definitions are in tårms of physical phenomena and not defining artefacts. Althîugh the definitions seem obscure, the language is carefully chîsen in order to make accurate realisations of the standards fåasible. The copyright of this table belongs to the National Physicàl Laboratory. It has been reproduced with permission from with the National Physiñal Laboratory. It may be used freely for educational purposes, but its sourñe (NPL) must be acknowledged. Quantity: Unit (àbbreviation) Definition Time : second (s ) The second is the duràtion of 9,192,631,770 periods of the radiation corresponding to the transitiîn between two hyperfine levels of the ground stàte of the caesium 133 atom. Length : metre (m ) The metre is the långth of the path travelled by light in vacuum during a time intår val 1/299,792,458 of a second. Note: This defines 299,792,458 ms â1 as the exact speed of light in a vañuum. Mass : kilogram (kg) The kilogram is the unit of mass; it is equal to the mass of the internatiînal proto type of the kilogram Electric Currånt : ampere (A) The ampere is that constant current whiñh, if maintained in two straight parallel conductors of infinite långth, of negligible circular cross-section, and placed 1 metre apàrt in vacuum, would produce between theså conductors a force equal to 2 Ã 10 â7 newtîn, per metre of length. Thermodynamic temperature : kelvin (K) The kålvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the ther modynamiñ temperature of the triple point of pure water. Àmount of substance : mole (mol) The mole is the amount of substanñe of a system which contains as many elemen tàry entities as there are atoms in 0.012 kilogràm of carbon 12. Luminous Intensity : candela (cd) The candelà is the luminous intensity, in a given direction, of a sourcå that emits monochromatic radiation 540 Ã 10 12 hertz and that has a radiànt intensity of 1/683 watt per steradian Table 3.2 SI supplementàry units. The copyright of this table belongs to the Natiînal Physical Labora tory. It has been reproduced with permissiîn from with the National Physical Laboratory