Document ID: chunk:federal_register_of_legislation:F2024C01009:schedule:1:p3
Version: federal_register_of_legislation:F2024C01009
Segment Type: schedule
Provision Reference: sch 1 (pt 3/4)
Character Range: 109061–112711

an arc equal in length to the radius.
2.20  solid angle                                                          steradian  sr      The steradian is the solid angle that has its vertex in the centre of a sphere and cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere.
2.21  catalytic activity                                                   katal      kat     The katal is a unit of catalytic activity equal to 1 mole per second.

Part 3—Non‑SI units of measurement used with SI units of measurement

Item  Quantity               Name            Symbol    Definition
3.1   sound power level      decibel         dB        In measuring sound power level in decibels, the number of decibels is the number equal to 10 times the logarithm to the base 10 of the ratio of the sound power in the particular case expressed in watts to a reference sound power of
                                                       10–12 watts.
3.2   sound pressure level   decibel         dB        In measuring sound pressure level in decibels, the number of decibels is the number equal to 20 times the logarithm to the base 10 of the ratio of the root‑mean‑square sound pressure in the particular case expressed in pascals to a reference sound pressure of
                                                       2  10–5 pascals.
3.3   sound intensity level  decibel         dB        In measuring sound intensity level in decibels, the number of decibels is the number equal to 10 times the logarithm to the base 10 of the ratio of the sound intensity in the particular case expressed in watts per square metre to a reference sound intensity of 10–12 watts per square metre.
3.4   area                   hectare         ha        104 m2
3.5   energy                 electron‑volt   eV        The kinetic energy acquired by an electron in passing through a potential difference of 1 volt in vacuum.
                                                       1 eV = 1.602 177 33  10–19 J
3.6   kinematic viscosity    stokes          St        10–4 m2/s
3.7   length                 nautical mile   n mile    1852 m
3.8   mass                   tonne           t         103 kg
3.9   mass                   metric carat    CM or ct  0.2  10–3 kg
3.10  plane angle            degree          º          /180 rad
3.11  plane angle            minute                   1/60   /180 rad
3.12  plane angle            second                   1/3 600   /180 rad
3.13  time                   day             d         86 400 s
3.14  time                   hour            h         3 600 s
3.15  time                   minute          min       60 s
3.16  temperature            degree Celsius  ºC        A degree Celsius is equal in magnitude to a kelvin.
                                                       t(ºC) = T(K) – 273.15
                                                       where:
                                                       t(ºC) is the numerical value of temperature in degrees Celsius.
                                                       T(K) is the numerical value of temperature in kelvins.
3.17  velocity               knot            kn        1852/3600 m/s
3.18  viscosity              poise           P         10–1 Pa.s
3.19  volume                 litre           L or l    10–3 m3

Part 4—Additional derived units of measurement

Item  Quantity                                                             Name                       Symbol    Definition
4.1   mass                                                                 gram                       g