It is defined by taking the fixed numerical value of the Boltzmann constant k to be 1.380 649 × 10 -23 when expressed in the unit J K -1, which is equal to kg m 2 s -2 K -1, where the kilogram, metre and second are defined in terms of h, c and Δ v Cs. The kelvin, symbol K, is the SI unit of thermodynamic temperature. It is defined by taking the fixed numerical value of the elementary charge e to be 1.602 176 634 × 10 -19 when expressed in the unit C, which is equal to A s, where the second is defined in terms of Δ v Cs. The ampere, symbol A, is the SI unit of electric current. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10 -34 when expressed in the unit J s, which is equal to kg m 2 s -1, where the metre and the second are defined in terms of c and Δ v Cs. The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m/s, where the second is defined in terms of Δ v Cs. The metre, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the caesium frequency Δ v Cs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s -1. The second, symbol s, is the SI unit of time. For paragraph 1 of Schedule 1 to the Units of Measurement Regulations 1986( 4) (definitions of SI base units( 5)) substitute. Amendment of the Units of Measurement Regulations 1986ģ. (b) in the definition given for “WATT”, after “joule”, insert “, where the second has the meaning given in the definition of “AMPERE””. “for which the symbol “A” is used, is the SI unit of electric current, defined by taking the fixed numerical value of the elementary charge e to be 1.602 176 634 × 10 -19 when expressed in the unit C, which is equal to A s, where the second is defined by taking the fixed numerical value of the caesium frequency Δ v Cs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s -1. (a) for the definition given for “AMPERE” substitute. In the third column of the table in Part 7 of Schedule 1 to the Weights and Measures Act 1985( 3) (definitions of units of measurement of electricity). Amendment of the Weights and Measures Act 1985Ģ. (a) may be cited as the Weights and Measures Act 1985 (Amendment) and Units of Measurement Regulations 1986 (Amendment) Regulations 2019 and The Secretary of State is a Minister designated( 2) for the purposes of section 2(2) of that Act in relation to units of measurement to be used for economic, health, safety, or administrative purposes.
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