By H. G. Jerrard BSc, PhD, FInstP, D. B. McNeill TD, MSc, PhD, FInstP (auth.)

ISBN-10: 0412281007

ISBN-13: 9780412281006

ISBN-10: 9401705712

ISBN-13: 9789401705714

and by way of the Librarians and Staffs of the collage and the general public Libraries at Southampton. eventually, we want to thank Mrs H. G. Jerrard and omit 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 e-book of the fourth version in 1980 advances in expertise have resulted in extra certain values of the elemental actual constants and a circulation in the direction of definitions of the elemental devices of mass, size and time in line with atomic parameters. extra specified definitions of a few different devices reminiscent of the candela were authorized via the foreign committees. those adjustments, including the definitions of numerous new devices were integrated 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 via advice 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 booklet to supply the main entire and updated details of its sort available.

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**Additional info for A Dictionary of Scientific Units: Including dimensionless numbers and scales**

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Ten years. u. cm or 3·336x 10 -30 coulomb metre. s. u. cm. s. u. u. cm. The unit first received a name in 1934[6], but it is frequently used in the abbreviated form, which is the letter D. It has also been defined as the product of the electronic charge and either the radius of the first Bohr orbit of hydrogen giving a value 0[2·54 x 10- 18 CGS units or one angstrom giving a value of 4·803 x 10- 18 CGS units. It is named after P. J. W. Debye (1884--1966) the pioneer authority on polar molecules.

The latter system was introduced by the Royal Photographic Society in 1881 and approved by an International Conference in Paris in 1900. Twofsystems are in use and in both eachfnumber represents a 50 per cent reduction in speed compared with the number preceding it. The systems are given in Table 3, the first being used by English-speaking countries while the second is common in Europe. The US numbers are 1,2,4,8, 16,32, in which 1 corresponds tof/4. TABLE 3. Standard f numbers US number fnumber (English) fnumber (Continental) 2 1·4 1·6 2·8 2·3 3·2 1 2 4 8 16 4 5·6 8 11 16 4·5 6·3 9 12·5 Fahrenheit scale See Temperature scales.

Euler number (Eu) A number used in fluid dynamics defined by pi pv 2, where p is pressure, p density and v veiosity. It is named after the German mathematician L. Euler (1707-83). F fnumber The light-gathering power of telescope and camera objective lenses is expressed by the relative aperture which, provided the object is at infinity, is the ratio of the focal length to the diameter of the entrance pupil. For a single lens the entrance pupil coincides with the lens itself. In photography the relative aperture is called thefnumber and is considered to indicate the speed of the lens[l].

### 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.)

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