1987 Ed.]
Metrication
SECOND SCHEDULE
[CAP. 214
5
(s. 2.]
Quantity Name Symbol Value in SI units time minute min 60 s time hour h 3 600 s time day d 86 400 s plane angle degree ° (π/180) rad plane angle minute ' (π/10 800) rad plane angle second '' (π/648 000) rad area hectare ha 104 m2 volume litre L 10-3 m3 mass tonne t 103 kg Celsius temperature degree Celsius °C See Note 1 mass per unit length tex tex 10-6 kg/m length nautical mile (international) nmi 1 852 m speed velocity knot (international) kn (1 852/3 600) m/sNotes
(1) In addition to the thermodynamic temperature (symbol T), expressed in kelvins, use is also made of Celsius temperature (symbol t) defined by the equation t = T - T0 where T0 = 273.15 K by definition. Celsius temperature is expressed in degrees Celsius (symbol °C). The unit "degree Celsius" is equal to the unit "kelvin" and an interval or a difference of Celsius temperature may also be expressed in degrees Celsius.
(2) This unit is used in the textile industry for the measurement of the linear density of yarn.
(3) Related to nautical and aeronautical navigation and meteorology. One knot is equal to one nautical mile per hour.
THIRD SCHEDULE
Quantity Non-metric basic unit Value in SI base unit length yard 0.914 4 m mass pound 0.453 592 37 kg capacity gallon 4.546 09 × 10−3 m3 temperature interval degree Fahrenheit 5/9 KNotes
(s. 3.]
(1) Correct to 6 significant figures.
(2) A formal definition of the Fahrenheit scale of temperature is not thought to exist, but for most practical purposes Fahrenheit temperature may be defined by the equation tf = 1.8T - 459.67 where tf is the Fahrenheit temperature expressed in degrees Fahrenheit (symbol °F) and T is the thermodynamic temperature expressed in kelvins (symbol K).
L.N. 189/87.