By H. G. Jerrard BSc, PhD, FInstP, D. B. McNeill TD, MSc, PhD, FInstP (auth.)
and by way of the Librarians and Staffs of the college and the general public Libraries at Southampton. eventually, 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 college of Southampton 1963 Preface to the 5th ed ition because the ebook of the fourth variation in 1980 advances in expertise have ended in extra specified values of the elemental actual constants and a flow in the direction of definitions of the elemental devices of mass, size and time according to atomic parameters. extra designated definitions of a few different devices similar to the candela were licensed via the overseas committees. those alterations, including the definitions of a number of 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 most up-to-date compilation by means of recommendation and kindly feedback and Margaret Wainwright who has had the tough and tedious job oftyping, retyping and copying the fragmented components that come up from a textual content revision. on the time of going to press we think this ebook to supply the main whole and updated info of its type available.
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Additional info for A Dictionary of Scientific Units: Including dimensionless numbers and scales
Thus conditions at - 25°F with a wind of 15 miles h - 1 have a chill wind factor of 40. Chroma scale A colour scale. ) Chronon The shortest unit of time is considered by some to be time taken for electromagnetic radiation to cover a distance equal to the radius of an electron; this comes to about 10- 23 second and it is called the chronon or tempon. Circular mil A unit of area used for describing the area of a conductor of circular crosssection. A conductor of diameter M mils has a cross-sectional area of M2 circular mils.
In a grade XI earthquake railway tracks would be distorted; the material destruction in a XII class earthquake is not precisely defined. The scale was proposed by G. Mercalli in 1902 who adopted it from an earlier one introduced by M. S. Rossi and F. A. Forrell in 1883. The original Mercalli was modified in 1931; the new version is called the Modified Mercalli or MM scale. The scale now generally used to give the absolute intensity rating of an earthquake is the Richter scale. This scale reading 1, 2, 3, etc.
Einstein unit A unit used to describe the photoenergy involved in a gram molecule of a substance during a photochemical reaction. It is equal to Nhv where N is Avogadro's constant, h is Planck's constant and v is the frequency of the electromagnetic radiation. The unit was in use in 1940 and is nai-:ted after A. Einstein (1879-1955) who explained the photoelectric effect in 1905. Ekman number This number was used by the Swedish scientist V. W. Ekman in his work on ocean currents. It expresses the ratio of the viscosity force to the Coriolis force.
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.)