Clinical Biochemistry of Domestic Animals (Sixth Edition) - UMK ...

Appendix I
SI Units
The Systeme International d’Unites (SI), or the International
System of Units, was recommended for use in the health
professions by the World Health Assembly (WHA 30.39) in
May of 1977. The SI is the culmination of more than a century
of effort to develop a universally acceptable system of
units of measure. Since the 1990s, the use of SI has been rapidly
gaining acceptance with many nations now mandating
its use and many others strongly recommending its use.
Furthermore, many scientific journals now require that units
be expressed in SI along with the conventional units, if used.
The following tables in this appendix briefly describe the
basis of SI and provide factors for the conversion of conventional
units to SI.
TABLE A SI Base Units
Quantity Name of Unit Symbol
Length meter (metre) m
Mass kilogram kg
Time s econd s
Electric current a mpere A
Thermodynamic temperature k elvin K
Luminous intensity c andela cd
Amount of substance m ole mol
TABLE C SI Prefixes
Factor Prefix Symbol Factor Prefix Symbol
10 18 exa E
1
10 deci d
10 15 peta P 10 2 centi c
10 12 tera T 10 3 milli m
10 9 giga G
6
10 micro μ
10 6 mega M 10 9 nano n
10 3 kilo k 10 12 pico p
10 2 hector h
15
10 femto f
10 1 deca da 10 18 atto a
TABLE D Non-SI Units Still in General Use
TABLE B SI Derived Units
Quantity Name of Unit Symbol
Area square meter m
2
Volume cubic meter m
3
Speed, velocity meter per second m/s
Acceleration
Substance
concentration
meter per second
squared
m/s
2
mole per cubic meter mol/m 3
Pressure pascal Pa
Work, energy joule J
Celsius temperature degree Celsius °C
Quantity Unit Symbol Value in SI
Time minute m 60 s
h our h 3,600 s
d ay d 86,400 s
Volume liter (litre) l
a
10 3 m 3
Mass t onne t 1,000 kg
Length a ngstrom Å 10 10 m (0.1 nm)
Pressure b ar bar 10 5 Pa
a tmosphere atm 101,325 Pa
mmHg mmHg 1.333 10 4 Pa
Radioactivity curie Ci 3.7 10 10 Bequerel(Bq)
roentgen R
4
2.58 10 Ci/kg
rad rad 10 2 gray(Gy)
rem rem 10 2 sievert(Sv)
a
Liter is often spelled out or symbolized by L to avoid confusion.
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