Introduction | Definitions
Abbreviations and symbols | Conversion factors

The following abbreviations and symbols have been used in the publication:
C:H	ratio between carbon and hydrogen
cSt	centistoke
C3H8	chemical symbol for propane gas
C4H10	chemical symbol for butane gas
°C	degree Celsius
kcal	kilocalorie
kg	kilogramme
kg/cm2	kilogramme per square centimetre
KJ	kilojoule
kWh	kilowatt-hour
LPG	liquefied petroleum gas
mg/g	milligramme per gramme
MJ	megajoule (106 joules)
NGL	natural gas liquids
RON	research octane number
t	metric ton
TCE	ton of coal equivalent
TJ	terajoule (1012 joules)
TOE	ton of oil equivalent
*	estimate by the Statistics Division of the United Nations Secretariat
..	data not applicable or not available
0	less than 0.5 of the unit specified or nil.