SOCIETY OF COSMETIC CHEMISTS OF GREAT BRITAIN 65 14.30 10. 15.00 15.30 16.00 16.20 16.50 "Dust explosion hazards" Professor H. E. Rose, D.Sc., Ph.D., F.I.C.E., F.i.Mech. E., M.I.Chem. E. (King's College, London). 11. "The method of irreversible thermodynamics applied to an infra-red drying process" R. W. Maxwell, B.Sc., Ph.D. (University of Leicester, Leicester). 12. "Blending operations" Professor D.C. Freshwater, B.Sc., Ph.D., D.L.C., M.I.Chem. E. (University of Technology, Loughborough). TEA 13. "The effects of granule properties on the pore structure of sucrose and lactose tablets" A. B. Selkirk, B.Sc., and D. Ganderton, B.Pharm., Ph.D., M.P.S. (University of Strathclyde, Glasgow). 14. "Some aspects of handling powder in mechanical equipment" L. Bates, M.I.Mech. E. ( Faiway Engineering Co., Ltd., Worsley, nr. 3•oeanchester). 19.00 for 19.30 BANQUET 09.30 Friday, 18th April 1969 15. "Compressed tablets from powders---The direct approach" J. L. Livingstone, B.Sc., F.P.S. (Sterling Winthrop Research and Development Division, Newcastle-upon-Tyne). 10.00 16. "Sampling and assessment of powder mixtures for cosmetics and pharma- ceuticals" J. A. Hersey, B.Pharm., Ph.D., M.P.S. (School of Pharmacy, London). 10.30 COFFEE 11.00 17o "Powder aerosols" A. Herzka, B.Sc., F.R.I.C. (Pressurized Packaging Consultants, London). 11.30 18. "The physical characteristics of powders influencing absorption" K. Marshall, B.Sc., M.P.S. (University of Bradford, Bradford). 12.30 LUNCH AFTERNOON--Works visits SYMPOSIUM ON GUMS AND THICKENERS A Symposium on Gums and Thickeners will take place in Oxford during the week beginning 13th October 1969. Programme Secretary Mr. K. M. Godfrey, c/o the Society's office, 56 Kingsway, London, W.C.2. SYMPOSIUM ON PERFUMERY A Symposium on Perfumery, organised joinfly with the British Society of Perfumers, will take place in Folkestone, Kent, from 131h-15th April 1970. Programme Secretary Mr. D. E. Butterfield, I.F.F. (Great Britain), Ltd., Crown Road, Southbury Road, Enfield, Middx. SYMPOSIUM ON CLEANSING A Symposium on Cleansing will take place in Bournemouth, Hants., during November 1970.

Metrication: Conversion factors, symbols and definitions BASIC SI UNITS physical quantity name of unit symbol for unit length metre m mass kilogramme kg time second s electric current ampere A thermodynamic temperature degree Kelvin øK luminous intensity candela cd Symbols for units do not take a plural forin. SUPPLEMENTARY UNITS These units are dimensionless. physical quantity name of unit plane angle radian solid angle steradian DERIVED UNITS kVITH SPECIAL NAMES physical name symbol quantity 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 /1 electric capacitance farad F magnetic flux weber Wb inductance henry H magnetic flux density tesla T luminous flux lumen lm illumination lux lx frequency hertz Hz customary temperature, t degree Celius øC FRACTIONS AND MULTIPLES fraction prefix symbol multiple I 10 -• deci d 10 10 -2 centi c 10 2 10 -3 milli m 103 10 -6 micro g 106 10 -9 nano n 109 l0 -12 pico p 1012 10 -15 femto f 10 -18 atto a symbol for unit rad sr 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 electric field strength magnetic field strength luminance definition of unit kg m2s -z kgms-2_-- Jm -• kg m2 s -3 ---- J s -l As kg m 2 s -3 A -• • J A -• s -• kg m 2 s -• A -2 = V A -• A 2 8 4 kg -• m -2 = A s V -• kg m 2 s-2A -• = V s kgni 2s -2A -• =VsA -• kg s -2 A -• = V s m -2 cd sr cd sr m -2 cycle per second t/øC = T/øK--273.15 prefix symbol deka da hecto h kilo k mega M giga G tera T 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 ampere per metre candela per square metre 66 symbol for unit m 2 m • kg m -• m s -• rad m 8 -2 N m -2 m 2 s-I Nsm -2 A m -• ca m -2