Measures & Units

Temperature

oC degree Celcius

Energy

cal calorie (1 cal = 4.184 J)
J joule (1 J = 0.239 cal)
W watt (J s-1)

Concentration

ppmv parts per million by volume
ppbv parts per billion by volume
pptv parts per trillion by volume
DU dobson unit

Distance

m meter

Area

m2 square meter
ha hectare (104 m2; 10-2 km2)

Mass

g gram
Tonne metric tonne (106 g; 1000 kg)

Numbers

thousand 103
million 106
billion 109

Time

s second
d day
yr year

Prefixes

c centi (10-2)
k kilo (103)
M mega (106)
G giga (109)
T tera (1012)
P peta (1015)
E exa (1018)

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