IPCC Special Report on Emissions Scenarios

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Appendix X: Units


Table X-1: SI (Systeme Internationale) Units and Fractions and Multiples Having Special Names
Physical Quantity
Name of Unit
Symbol

amount of substance
mole
mol
area
hectare
ha
energy
joule
J (kg m2 s-2)
force
newton
N (kg m s-2)
frequency
hertz
Hz (s-1 = cycles per second)
length
metre (meter in this report)
m
length
micron
mm (10-6 m)
power
watt
W (kg m2 s-3 = J s-1)
pressure
pascal
Pa (kg m-1s-2 = N m-2
temperature
kelvin
K
time
second
s
weight (mass)
kilogram
kg
weight
tonne (ton in this report)
t (103 kg)
weight
gram
g (10-3 kg)

 

Fraction
Prefix
Symbol

10-12
pico
p
10-9
nano
n
10-6
micro
m
10-3
milli
m
10-2
cent
c
10-1
deci
d
10
deca
da
102
hecto
h
103
kilo
k
106
mega
M
109
giga
G
1012
tera
T
1015
peta
P
1018
exa
E
1021 zetta
Z

 

Table X-2: Non-SI Units
C
 
degrees Celsius (0C = ~273K); Temperature differences are given in C rather than the more correct form of "Celsius degrees"
Btu British Thermal Unit (1.055 kJ)
kWh kilowatt-hour (3.6 MJ)
MWe megawatts of electricity (electrical capacity)
ppmv parts per million by volume (106)
ppbv parts per billion by volume (109)
pptv parts per trillion by volume (1012)
tce tons of coal equivalent (29.31 GJ)
toe tons of oil equivalent (41.87 GJ)
TWh terawatt-hour (3.6 PJ)

 



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