By H. G. Jerrard BSc, PhD, FInstP, D. B. McNeill TD, MSc, PhD, FInstP (auth.)
and by means of the Librarians and Staffs of the collage and the general public Libraries at Southampton. ultimately, we want to thank Mrs H. G. Jerrard and pass over A. J. Tutte for typing the manuscript. division of Physics H. G. JERRARD D. B. McNEILL collage of Southampton 1963 Preface to the 5th ed ition because the ebook of the fourth version in 1980 advances in expertise have resulted in extra detailed values of the basic actual constants and a flow in the direction of definitions of the basic devices of mass, size and time in response to atomic parameters. extra special definitions of a few different devices akin to the candela were authorized through the foreign committees. those alterations, including the definitions of numerous new devices were incorporated during this version, the textual content of which has been revised and which now comprises over 850 devices and dimensionless numbers. The authors desire to thank all those that have helped during this newest compilation by means of recommendation and kindly feedback and Margaret Wainwright who has had the tricky and tedious job oftyping, retyping and copying the fragmented elements that come up from a textual content revision. on the time of going to press we think this publication to supply the main whole and up to date details of its sort available.
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Additional resources for A Dictionary of Scientific Units: Including dimensionless numbers and scales
Is the wavelength in nanometres. In recent years it has become customary to write Me V and Ge V for mega (10 6 ) and giga (10 9 ) electron volts. In the USA 109 electron volts are often written as BeV, the letter B being used in this case as an abbreviation for the American billion (10 9 ), but in 1948 the International Union of Pure and Applied Physics disapproved of the use of BeV and expressed a preference for GeV or to 9 eV. The electron volt was called the equivalent volt when it was originally introduced in 1912.
The Graetz number is given by ndRP/4L, where d and L are the diameter and length of the pipe respectively, R is Reynolds' number and Pis Prandtl's number. The number is named after L. P. Graetz (1856-1941) the original investigator of heat transfer by modified laminar motion. The number was recognized by the American Standards Association in 1941 . Grain (gr) The smallest unit of mass in the English system. The grain is equal to 64·8 x 10 - 6 kg and is reputed to be named after a grain of wheat.
Lg m- 3 ) 0-50 50-250 250-1000 1000+ Typical substance Beryllium; blue asbestos silica coal dust cement Substances in Group IV are often of greater nuisance value than hazard to health. Clo The clo is a unit used in the measurement of the thermal insulation of clothing. It is the amount of insulation necessary to maintain comfort and a mean skin temperature of 92°F in a room at 70°F with air movement not over 10 feet per minute, humidity not over 50% with a metabolism of 50 kilocalories per square metre per hour.
A Dictionary of Scientific Units: Including dimensionless numbers and scales by H. G. Jerrard BSc, PhD, FInstP, D. B. McNeill TD, MSc, PhD, FInstP (auth.)