Book review CHEMICAL ANALYSIS OF INDUS- TRIAL WATER. ]. W. McCoy. Pp. xi + 292 q- Ilk (1969). Chemical Publish- ing Co., New York. $15.00. This is a useful and unpre- tentious volume which contains a wealth of information on industrial water and boiler house chemistry. Although it will undoubtedly be of use to those whose main concern is the analysis of industrial xvaters, it is perhaps of even more interest to those for whom such analyses and their associated problems are only a small part of their work. This is particularly true of the section on the Analysis of Deposits. The book is divided into four parts. The "Chemical principles of water treatment" provides a brief intro- duction to the rationale of treating feed and cooling waters and deals adequately with the principles involved. Part Two is concerned with the analyses of industrial waters and the interpretation of the results. The deter- ruination of some fifteen constituents is given in so•ne detail. Part Three relates to the use of special procedures, including the ana- lysis of foul waters and the evaluation of ion-exchange resins. Part Four sets out a suggested scheme for the systematic analysis of scales, sludges and deposits, with sug- gestit)ns for shortening the scheme when certain types of deposit are being examined. This is based on the author's experience and should form an in- valuable aid to anyone faced with such an analysis. The book is intelligibly written, appears to be free from major misprints and each of the four sections is followed by a copious list of references. It will find fayour in the small laboratory since most of the procedures are based on classical wet methods of analysis, and instrumentation has been kept within reasonable bounds. S.J. BUSH. Keywords Starting with this issue, keywords for computerized information storage and re- trieval are incorporated in the synopses at the beginning of each paper. Keywords will be set in capital letters for easy identification. 73

Metrication: Conversion factors, symbols and definitions BASIC SI UNITS physical quantity name of unit symbol for unit length metre m mass kilogra•mne kg time second s electric current ampere A thermodynamic temperature deg-ree Kelvin øK luminous intensity candela cd Symbols for units do not take a plural form. SUPPLEMENTARY UNITS The. se units are dimensionless. physical quantity name of unit plane angle radian solid angle stemdian symbol for unit rad sr DERIVED SI UNITS WITH SPECIAL NAMES physical name symbol quanti(v of unit .for unit energy joule J force newton N power watt W electric charge coulomb C electric potential difference volt V electric resistance ohm • electric capacitance farad F magnetic flux weber Wb inductance henry H magnetic flux density tesla T luminons flux lumen lm illumination lux lx trequency hertz Hz customary temperature, t deg-ree Celius øC FRACTIONS AND MULTIPLES definition of unit kg m2s -• kg m s -2 = J m -• kgm2s -• = js -• As kg m 2 s -s A -I •- J A-' s-' kgm 2s -s A -2 = VA-' A 2s 4kg -•m -2----- AsV-' kgm 2s-2A -' =Vs kg ni 2 s -2 A -2 =V s A-' kgs -2 A -• = Vsm -2 ca sr ca sr m-2 cycle per second t/øC = T/øK--273.15 fraction prefix symbol multiple prefix I 10-' deci d 10 deka 10 -2 centi c 102 hecto 1 (}- • milli m 10 • kilo 10- • micro It 10 • mega 10 -9 nano n 10 • giga 10-'2 pico p 10 '2 tera 10- • s femto f 10 -'• atto a * Restricted to instances where there is a strongly felt need. physical quantity area volume density velocity angular velocity acceleration pressure kinematic viscosity, diffusion coefficient dynamic viscosity eiectric field strength magnetic field strength luminance EXAMPLES OF OTHER DERIVED SI UNITS SI unit square metre cubic metre kilogramme per cubic metre metre per second radian per second metre per second squared newton per square metre square metre per second newton second per square metre volt per metre amppro per metre candela per square metre 74 symbol da h k M G T I . symbol for unit m 2 kg m -• m s -• rad s -t m s -2 N m -z m 2 s-I Nsm-2 Am-• cd m -•