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IPCC Fourth Assessment Report: Climate Change 2007
التقرير التوليفي
المحتوياتالمرفقاتالمرفق الثالثIII.2

III.2 Scientific units

SI (Système Internationale) units 
Physical Quantity Name of Unit Symbol 
length metre m 
mass kilogram kg 
time second s 
thermodynamic temperature kelvin K 
Fractions and multiples 
Fraction Prefix Symbol Multiple Prefix Symbol 
10-1 deci d 10 deca da 
10-2 centi c 102 hecto h 
10-3 milli m 103 kilo k 
10-6 micro µ 106 mega M 
10-9 nano n 109 giga G 
10-12 pico p 1012 tera T 
10-15 femto f 1015 peta P 
Non-SI units, quantities and related abbreviations 
°C degree Celsius (0°C = 273 K approximately); temperature differences are also given in °C (=K) rather than the more correct form of “Celsius degrees” 
ppm mixing ratio (as concentration measure of GHGs): parts per million (106) by volume 
ppb  mixing ratio (as concentration measure of GHGs): parts per billion (109) by volume 
ppt mixing ratio (as concentration measure of GHGs): parts per trillion (1012) by volume 
watt power or radiant flux; 1 watt = 1 Joule / second = 1 kg m2 / s3 
yr year 
ky thousands of years 
bp before present  
GtC gigatonnes (metric) of carbon 
GtCO2 gigatonnes (metric) of carbon dioxide (1 GtC = 3.7 GtCO2) 

CO2-eq

 

carbon dioxide-equivalent, used as measure for the emission (generally in GtCO2-eq) or concentration (generally in ppm CO2-eq) of GHGs; see Box “Carbon dioxide-equivalent emissions and concentrations” in Topic 2 for details

 

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