Reference

Unit Chart

Abbreviation	Unit	Measure of	Value
API gravity	unitless, but referred to in degrees	petroleum	<10 API gravity degrees - denser than water >10 API gravity degrees - less dense than water
cf	cubic foot	volume	28.31684 liters 1 foot³
ha	hectare	area	10,000 meters ²
HHV	higher heating value	energy per unit mass	gross calorific value
J	Joule	energy	1 Newton•meter
LHV	lower heating value	energy per unit mass	net calorific value (subtracts energy used to vaporize water in substance)
m	meter	length	SI base unit
mi	mile	length	1,609.344 meters
mya	million years ago	time	1 million years ago
P	Poise	viscosity	0.1 Pascal•second 5,280 feet
Pa	Pascal	pressure	1 Newton/meter ²
ppm	parts per million	volume concentration	10 ^-6
W	Watt	power	1 Newton•meter/second
Wh	Watt hour	energy	Watt•hour
t	tonne (metric tonne)	mass	1,000 kilograms

CCS - Carbon Capture and Sequestration

CO₂e - carbon dioxide equivalent

DOE - US Department of Energy

EIA - Energy Information Administration

EOR - Enhanced Oil Recovery

EPA - Environmental Protection Agency

ETS - Emissions Trading System

EU - European Union

GDP - Gross Domestic Product

HRSG - Heat Recovery Steam Generator

IEA - International Energy Agency

IGCC - Integrated Gasification Combined Cycle

IPCC - Intergovernmental Panel on Climate Change

OECD - Organization for Economic Cooperation and Development

R&D - Research & Development

UNEP - United Nation Environment Programme