First Schedule, Weights and Measures Act, 2010

Part 1 S.I. UNITS OF MEASUREMENT – THE BASIC UNITS Length ... ... ... metre ... ... ... m Time ... ... ... second ... ... ... s Mass ... ... ... kilogram ... ... ... kg Electric current .. .. ampere .... ... ... A Thermodynamic temperature kelvin ... ... ... K Luminous intensity ... ... candela ... ... ... cd Part 2 SUPPLEMENTARY AND DERIVED UNITS Plane angle ... ... ... radian ... ... ... rad Solid angle ... ... ... steradian ... ... ... sr Area ... ... ... square metre ... ... m2 Volume ... ... ... cubic metre ... ... ... m3 Angular velocity ... ... radian per second ... ... rad/s Angular acceleration.. .. radian per second squared rad/s 2 Velocity ... ... ... metre per second ... ... m/s Acceleration ... ... ... metre per second squared m/s2 Frequency ... ... ... hertz ... ... Hz (1Hz=1s-1 ) Rotational frequency ... reciprocal second ... ... s-1 Density ... ... ... kilogram per cubic metre... kg/m3 Momentum ... ... ... kilogram metre per second kg.m/s Angular momentum ... ... kilogram metre squared per second ... ... kg.m2 Moment of inertia ... ... kilogram metre squared ... kg.m2 Force ... ... ... newton ... ... ... N (N=kg.m/s2 ) Moment of force ... ... newton metre ... ... N.m Pressure, stress ... ... newton per square metre... N/m2 Kinematic viscocity ... ... metre squared per second m2 Dynamic viscocity ... ... newton second per metre squared ... ... Ns/m2 Surface tension ... ... newton per metre ... ... N/m Work, energy ... ... joule ... ... ... J (J=Nm) Power ... ... ... watt ... ... ... W (W=J/s) Impact strength ... ... joule per square metre ... J/m2 Temperature ... ... ... degree Celsius ... ... o C Temperature interval ... Kelvin degree Celsius ... K, o C Quantity of heat ... ... joule ... ... ... j Linear expansion co-efficient reciprocal Kelvin ... ... K-1 Heat flow rate ... ... watt ... ... ... W Density of heat flow rate ... watt per square metre ... W/m2 Thermal conductivity.. ... watt per metre kelvin ... W/(mK) Co-efficient of heat transfer ... watt per square metre ... W/m2 K Kelvin Heat Capacity ... ... joule per kelvin ... ... J/K Specific heat capacity ... joule per kilogram kelvin J/kg K Entropy ... ... ... joule per kelvin ... ... J/K Specific entropy ... ... joule per kilogram kelvin J/kg K Specific energy, specific latent heat ... ... ... joule per kilogram ... ... J/kg Quantity of electricity, electric Charge ... ... ... coulomb ... ... ... C=As Volume density of charge, ... coloumb per cubic metre... C/m3 charge density Surface density of charge ... coulomb per square metre C/m2 Electric field strength ... volt per metre ... ... V/m Electric tension, potential ... volt ... ... ... V=W/A difference, electromotive force Displacement (electric) ... coulomb per square metre C/m2 Electric flux, flux of displacement coulomb ... ... ... C Electric capacitance ... ... Farad ... .. .. F Electric permittivity ... ... farad per metre ... ... F/m Electric polarization ... ... coulomb per square metre C/m2 Electric dipole moment ... coulomb metre ... ... Cm Current density ... ... ampere per square metre A/m2 Linear current density ... ampere per metre ... ... A/m Magnetic field strength ... ampere per metre ... ... A/m Magnetic potential difference ampere ... ... ... A Magnetic flux density, magnetic tesla ... ... T (IT= 1 Wb/m2 ) induction Flux of magnetic induction, magnetic flux ... ... weber ... ... ... Wb (1Wb=IVs) Magnetic vector potential .. weber per metre ... ... Wb/m Self inductance, mutual inductance ... ... ... henry ... ... ... H (1H = 1Vs/A) Permeability ... ... ... henry per metre ... ... H/m Electromagnetic moment, magnetic moment ... ... ampere metre squared ... A/m2 Magnetization ... ... ampere per metre ... ... A/m Magnetic polarization ... tesla ... ... ... T Quantity ... ... ... Name of unit... ...Unit symbol Magnetic dipole moment ... Newton metre squared ... Nm2 /A per ampere or weber metre Wbm Impendance, reactance, modulus of impendence ... ... ohm ... ... ... n (n =V/A) Admittance, susceptance, conductance ... ... ... reciprocal ohm ... ... n -1 Apparent power ... ... volt ampere ... ... ... VA Reactive power ... ... Var ... ... ... Var Diffusion coefficient ... ... square metre per second m2 Thermal diffusion co-efficient square metre per second m2 Luminous flux ... ... lumen ... ... ... 1m(1 1m=1cd sr) Luminance ... ... ... candela per square metre... cd/m2 Illumination ... ... ... lux ... ... ... 1x (1 1x=lm/m2 ) Activity of radionuclides ... reciprocal second ... ... s- 1 Part 3 UNITS WHICH MAY BE USED IN CONJUNCTION WITH BASIC UNITS AND SUPPLEMENTARY AND DERIVED UNITS Time ... ... ... minute ... ... ... min. hour ... ... ... h day ... ... ... d week .. .. .. week month .. .. .. month year ... ... ... year Mass ... ... ... tonne ... ... ... t Carat .. .. .. carat Radian ... ... ... grade .. .. .. g second .. .. “ minute .. .. .. ‘ degree .. .. .. o Area ... ... ... hectare ... ... ... ha are ... ... ... a Volume ... ... ... litre ... ... ... l Velocity ... ... ... kilometer per hour ... ... km/h No. 5 Weights and Measures Act 2010No. 5 Weights and Measures Act 201020 Rotational frequency .. revolution per minute ... r.p.m. Pressure, stress ... ... bar ... ... ... bar Viscosity; Kinematic ... ... ... centistokes ... ... ... cSt Quantity ... ... ... Name of unit... ...Unit symbol Dynamic ... ... ... centipoises ... ... ... cP Work, energy... ... ... kilowatt hour ... ... kWh Electron volt... ... ... eV Activity of radionuclide ... curie ... ... ... ci Part 4 MULTIPLES AND SUBMULTIPLES OF UNITS OF MEASUREMENT The names of the multiples and sub-multiples of the units of measurement are formed by means of the following prefixes: Factor by which the prefix symbol units multiplied 1012 ... ... ... tera ... ... ... T 109 ... ... ... giga ... ... ... G 106 ... ... ... mega ... ... ... M 103 ... ... ... Kilo ... ... ... k 102 ... ... ... hecto ... ... ... h 10 ... ... ... deca ... ... ... da 10-1 ... ... ... deci ... ... ... d 10-2 ... ... ... centi ... ... ... c 10-3 ... ... milli ... ... ... m 10-6 ... ... ... micro ... ... ... μ 10-9 ... ... ... nano ... ... ... n 10-12 ... ... ... pico ... ... ... p 10-15 ... ... ... femto ... ... ... f 10-15 ... ... ... femto ... ... ... f 10-18 ... ... ... atto ... ... ... a APPENDIX (i) Definition of Basic Units The metre (m): unit of length. The metre is the length equal to 1,650,763.73 wavelength in vacuum of the radiation corresponding to the transition between the levels 2p10 and 5d5 of the krypton -86 atom. The second(s): unit of time interval. The second is the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the caesium – 133 atom. The kilogram (kg): unit of mass. The kilogram is equal to the mass of the international prototype of the kilogram. The ampere (A): unit of electric current. The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in a vacuum would produce between these conductors a force equal to 2 x 10-7 newton per metre of length. The Kelvin (K): unit of thermodynamic temperature. The Kelvin is the fraction 1/ 273.16 of the thermodynamic temperature of the triple point of water. The candela (cd): unit of luminous intensity. The candela is the luminous intensity, in the perpendicular direction, of a surface of 1/600,000 square metre of a black body at the temperature of freezing platinum under a pressure of 101,325 newtons per square metre. (ii) Definition of Supplementary Units The Radian (rad): unit of plane angle. The angle between two radii of a circle which cut off on the circumference an arc equal in length to the radius. The Steradian (sr): unit of solid angle. The solid angle which, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to that of a square having sides of length equal to the radius of the sphere.