The Units of Measurement Regulations 2009

• Citation: S.I. 2009/3046
• Sections: 5

Section 1 Citation and commencement

These Regulations may be cited as the Units of Measurement Regulations 2009 and come into force on 1st January 2010.

Section 2 Interpretation

In these Regulations, “the 1986 Regulations ” means the Units of Measurement Regulations 1986 .

Section 3 Removal of time limit on use of supplementary indications

(1) In section 8(5A) of the Weights and Measures Act 1985 (which allows the use for trade of supplementary indications up to and including 31 December 2009), omit “up to and including 31 December 2009,”.

(2) In regulation 7 of the 1986 Regulations (which relates to supplementary indications), omit “up to and including 31 December 2009”.

Section 4 Further amendments of the 1986 Regulations

(1) The 1986 Regulations are further amended as follows.

(2) In Schedule 1—

(a) in paragraph 1—

(i) at the end of the entry beginning “The kelvin” insert “This definition refers to water having the isotopic composition defined by the following amount-of-substance ratios: 0.00015576 mole of ²H per mole of ¹H, 0.0003799 mole of 17 O per mole of 16 O and 0.0020052 mole of 18 O per mole of 16 O.”; and

(ii) in the italic heading “Special name and symbol of the SI unit of temperature for expressing Celsius temperature”, for “SI unit” substitute “SI derived unit”;

(b) in paragraph 2—

(i) for the italic heading “Other SI units” substitute “SI derived units”;

(ii) omit sub-paragraph (1);

(iii) for sub-paragraph (2) substitute—

(2) General rule for SI derived units

Units derived coherently from SI base units are given as algebraic expressions in the form of products of powers of the SI base units with a numerical factor equal to 1.

(iv) for sub-paragraph (3) substitute the table and the notes set out in the Schedule.

Section 5 Consequential amendments of the Units of Measurement Regulations 2001

(1) The Units of Measurement Regulations 2001 are amended as follows.

(2) In regulation 2 omit—

—

“ the Act ” means the Weights and Measures Act 1985, and

(3) Omit regulations 3 and 4(2).