This is a handy reference for students, teachers, and practitioners in engineering, physics, sciences, and technical subjects. More than 3500 conversion factors are given; these have been calculated from primary conversion factors agreed internationally. All conversion factors are given to the greatest accuracy possible up to ten significant figures. The conversion factors are grouped into unit types by areas of science, and range from angular acceleration to volume flow. An appendix of agreed primary conversion factors is given. Also of practical help are appendices of common mathematical and engineering formulae. `This is an excellent (almost pocket-sized) reference book covering nearly four thousand conversion factors relating to quantities used every day in science, engineering and technology. The layout is exceptionally well organised for ease of reference and the volume also contains a good deal of numerical data.' ASLIB Booklist'A handy little volume giving more than three-and-a-half thousand conversion factors given directly.' The Structural Engineer, Volume 72, No. 19/4 October 1994 James L. Cook is a freelance Mechanical Design Engineer