STATUTORY RULES
1972 No. 62
REGULATIONS UNDER THE WEIGHTS AND MEASURES (NATIONAL STANDARDS) ACT 1960-1966.*
I, THE GOVERNOR-GENERAL in and over the Commonwealth of Australia, acting with the advice of the Federal Executive Council, hereby make the following Regulations under the Weights and Measures (National Standards) Act 1960-1966.
Dated this third day of May, 1972.
Paul Hasluck
Governor-General.
By His Excellency’s Command,
SGD. MALCOLM FRASER
Minister of State for Education and Science.
Amendments of the Weights and Measures (National Standards) Regulations†
Parts.
1. Regulation 2 of the Weights and Measures (National Standards) Regulations is amended by inserting after the words—
“ Division 6.—Density (Regulations 21-23).”
the words—
“ Division 6a.—Angle (Regulations 23a-23e).”.
2. After Division 6 of Part II. of the Weights and Measures (National Standards) Regulations the following Division is inserted:—
“Division 6a.—Angle.
Units of measurement of plane angle.
“ 23a.—(1.) The units of measurement of plane angle are the units specified in the first column of the Twenty-seventh Schedule and are related to the radian, the degree or the grade, as the case may be, as respectively specified in the second column of that Schedule.
“ (2.) A unit of measurement of plane angle specified in the first column of the Twenty-seventh Schedule may be referred to by the abbreviation or symbol (if any) specified in the third column of that Schedule opposite the reference to that unit in the first column.
The radian, the degree and the grade.
“ 23b.—(1.) The radian is the plane angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius.
“ (2.) The degree is the plane angle between two radii of a circle that cut off on the circumference an arc that is one-three hundred and sixtieth part of the circumference.
“ (3.) The grade is the plane angle between two radii of a circle that cut off on the circumference an are that is one four hundredth part of the circumference.
* Notified in the Commonwealth Gazette on 1972.
† Statutory Rules 1961, No. 142, as amended by Statutory Rules 1963, No. 126; 1964, No. 146; 1965, No. 13; 1968, No. 150; and 1970, No. 40.
19935/71—Price 8c 10/23.3.1972
Conversion factors.
“ 23c.—(1.) For all legal purposes—
(a) one degree shall be deemed to be equal to 
radians; and
(b) one grade shall be deemed to be equal to 
radians,
where π is the ratio of the circumference of a circle to the diameter of the circle.
“ (2.) For the purposes of this regulation, the ratio of the circumference of a circle to the diameter of the circle shall be deemed to be equal to 3.141592654.
Unit of measurement of solid angle.
“ 23d.—(1.) The unit of measurement of solid angle is the steradian.
“ (2.) The steradian may be referred to by the abbreviation ‘ sr ’.
The steradian.
“ 23e. 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.”.
Fifteenth Schedule.
3. The Fifteenth Schedule to the Weights and Measures (National Standards) Regulations is repealed and the following Schedule inserted in its stead:—
FIFTEENTH SCHEDULE. Regulation 44.
Units of Measurement of Pressure.
| First Column | Second Column | Third Column |
| Name of Unit | Pressure in Newtons per Square Metre, Pounds-force per Square Inch, Centimetres of Mercury, or Inches of Water | Abbreviation |
| | Newtons per Square Metre | |
| Atmosphere ....................................... | 101 325 ................................. | atm |
| Bar .................................................... | 100 000 ................................. | b |
| Kilogramme-force per square centimetre or kilogramme per square centimeter........................... | 98 066.5 .............................. | kgf/sq cm or kgf/cm2 or kg/sq cm or kg/cm2 |
| Torr ................................................... | 133.322 4 ....................... | .. |
| Millibar ............................................. | 100 ................................. | mbar or mb |
| Newton per square metre .................. | 1 ................................ | N/sq m or N/m2 |
| Pascal ................................................ | 1 ................................ | Pa |
| Dyne per square centimetre ............... | 0.1 ............................. | dyn/sq cm or dyn/cm2 |
| | Pounds-force per Square Inch | |
| Ton-force per square inch ................. | 2 240 ................................. | tonf/sq in or tonf/in2 or ton/sq in or ton/in2 |
| Kip per square inch ........................... | 1 000 ................................. | kip/sq in or kip/in2 |
| Ton-force per square foot ................. | 15.555 6 ....................... | tonf/sq ft or tonf/ft2 or ton/sq ft or ton/ft2 |
| Kip per square foot ........................... | 6  ............................ | kip/sq ft or kip/ft2 |
| Pound-force per square inch or pound per square inch ................... | 1 ................................. | lbf/sq in or lbf/in2 or lb/sq in or lb/in2 or psi |
| Pound-force per square foot or pound per square foot .............................. |  ..............................
| lbf/sq ft or lbf/ft2 or lb/sq ft or lb/ft2 or psf. |
| Poundal per square inch .................... | 0.031 081 0................. | pdl sq in or pdl/in2 |
Fifteenth Schedule—continued
| First Column | Second Column | Third Column |
| Name of Unit | Pressure in Newtons per Square Metre, Pounds-force per Square Inch, Centimetres of Mercury, or Inches of Water | Abbreviation |
| | Centimetres of Mercury | |
| Centimetre of mercury ................... | 1 ............................. | cmHg |
| Millimetre of mercury .................... | 0.1 .......................... | mmHg |
| | Inches of Water | |
| Inch of water .................................. | 1 ............................. | inH2O |
| Foot of water .................................. | 12 ............................. | ftH2O |
Schedules.
4. The Weights and Measures (National Standards) Regulations are amended by adding at the end thereof the following Schedule:—
TWENTY-SEVENTH SCHEDULE. Regulation 23a.
Units of Measurement of Plane Angle.
| First Column | Second Column | Third Column |
| Name of Unit | Angle in Radians, Degrees or Grades | Abbreviation or Symbol |
| | Radians | |
| Radian ..................................................................................... | 1 | rad |
| Milliradian ............................................................................... | 1 x 10 -3 | mrad |
| Microradian ............................................................................. | 1 x 10 -6 | µrad |
| | Degrees | |
| Degree ..................................................................................... | 1 | ° |
| Minute ..................................................................................... | 1/60 | ′ |
| Second ..................................................................................... | 1/3600 | ″ |
| | Grades | |
| Grade ....................................................................................... | 1 | g |
| Centigrade ................................................................................ | 1 x 10 -2 | .. |
| Milligrade ................................................................................. | 1 x 10 -2 | .. |
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