Document ID: chunk:federal_register_of_legislation:F2016L00538:reg:13:p2
Version: federal_register_of_legislation:F2016L00538
Segment Type: reg
Provision Reference: reg 13 (pt 2/4)
Character Range: 3729–7139

combined:
           (a)   to produce an Australian legal unit of measurement; and
           (b)   with prefixes to produce Australian legal units of measurement.
Note   These Guidelines are a disallowable instrument: subsection 7B (2) of the Act.
      6                            Definitions

      In these Guidelines:
Product Symbol means a symbol used to indicate the product of 2 or more Australian legal units of measurement.
Regulations mean the National Measurement Regulations 1999.
SI Prefix means a prefix mentioned in Schedule 3 of the Regulations.
Note   Several other words and expressions used in these Guidelines have the meaning given by section 3 of the Act.
      7                            Physical quantities

      Australian legal units of measurement may be formed only for the physical quantities as prescribed under the Regulations.
      8                            Combining Australian legal units of measurement
         (1)     An Australian legal unit of measurement for a physical quantity may be formed by combining Australian legal units of measurement according to the mathematical relations linking the corresponding physical quantities.
         (2)     The resulting Australian legal unit of measurement may be represented by using a name or symbol that is itself formed from derived units.

      Example   pascal (pressure in newtons per square metre): Pa = N/m2.
      9                            Combining Australian legal unit of measurement and prescribed SI prefix
         (1)      A decimal multiple, or submultiple, of an Australian legal unit of measurement must be formed by using a single SI Prefix.
Example   Nanometre: 1 nm or 1 x 10-9 m, but not 1 mµm.
         (2)      Subsection 9(1) of these Guidelines does not apply to kilogram.
Example   kJ/kg
Note   Kilogram is an SI base unit of measurement: see Regulations, Sch 1, item 1.1.
         (3)      An additional derived unit of measurement, mentioned in Part 4 of Schedule 1 to the Regulations, may be combined with another Australian legal unit of measurement to form an Australian legal unit of measurement.
         Note   An exponent associated with a symbol for an Australian legal unit of measurement indicates that the multiple, or submultiple, of the unit is raised to the power expressed by the exponent.
         (4)      The combination of the unit and a prefix may be combined with other Australian legal unit of measurement symbols to form the symbol for a compound unit that is an Australian legal unit of measurement.
Example   Speed in kilometres per hour: km/h.
      10                        Australian legal units of measurement that must not be combined with prefixes
         (1)      The following Australian legal units of measurement must not be combined with SI prefixes:

              *        kilogram

              *        minute

              *        hour

              *        day

              *        decibel

              *        inch

              *        foot

              *        hectare

              *        ounce

              *        foot/minute

              *        degree

              *        minute

              *        second of arc

              *        radian

              *        steradian

              *        degree Celsius
         (2)      A decimal multiple or sub-multiple of kilogram must be formed by