# Category: Units of energy

British thermal unit
The British thermal unit (BTU or Btu) is a unit of heat; it is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. It is also part of the Un
Tonne of oil equivalent
The tonne of oil equivalent (toe) is a unit of energy defined as the amount of energy released by burning one tonne of crude oil. It is approximately 42 gigajoules or 11.630 megawatt-hours, although a
Electronvolt
In physics, an electronvolt (symbol eV, also written electron-volt and electron volt) is the measure of an amount of kinetic energy gained by a single electron accelerating from rest through an electr
Orders of magnitude (energy)
This list compares various energies in joules (J), organized by order of magnitude.
Calorie
The calorie is a unit of energy. For historical reasons, two main definitions of "calorie" are in wide use. The large calorie, food calorie, or kilogram calorie was originally defined as the amount of
Kilopondmetre
The Kilopondmetre is an obsolete unit of torque and energy in the gravitational metric system. It is abbreviated kp·m or m·kp, older publications often use m­kg and kg­m as well. Torque is a product o
Prout (unit)
The Prout is an obsolete unit of energy, whose value is: This is equal to one twelfth of the binding energy of the deuteron. * v * t * e
TNT equivalent
TNT equivalent is a convention for expressing energy, typically used to describe the energy released in an explosion. The ton of TNT is a unit of energy defined by that convention to be 4.184 gigajoul
Horsepower-hour
A horsepower-hour (symbol: hp⋅h) is an outdated unit of energy, not used in the International System of Units. The unit represents an amount of work a horse is supposed capable of delivering during an
Units of energy
Energy is defined via work, so the SI unit of energy is the same as the unit of work – the joule (J), named in honour of James Prescott Joule and his experiments on the mechanical equivalent of heat.
Barrel of oil equivalent
The barrel of oil equivalent (BOE) is a unit of energy based on the approximate energy released by burning one barrel (42 US gallons, 35 imp gal or 158.987294928 litres) of crude oil. The BOE is used
A Cubic Mile of Oil
A Cubic Mile of Oil is a 2010 book by Hewitt Crane, Edwin Kinderman, and Ripudaman Malhotra. The title refers to a unit of energy intended to provide a visualizable scale for comparing large amounts o
Joule
The joule (/ˈdʒuːl/ JOOL, also non-standard /ˈdʒaʊl/ JOWL; symbol: J) is the unit of energy in the International System of Units (SI). It is equal to the amount of work done when a force of 1 newton d
Watt-hour per kilogram
The watt-hour per kilogram (SI symbol: W⋅h/kg) is a unit of specific energy commonly used to measure the density of energy in batteries and capacitors.
A quad is a unit of energy equal to 1015 (a short-scale quadrillion) BTU, or 1.055×1018 joule (1.055 exajoules or EJ) in SI units. The unit is used by the U.S. Department of Energy in discussing world
Rydberg constant
In spectroscopy, the Rydberg constant, symbol for heavy atoms or for hydrogen, named after the Swedish physicist Johannes Rydberg, is a physical constant relating to the electromagnetic spectra of an
Billion cubic metres of natural gas
Billion cubic meters of natural gas (abbreviated: bcm) or cubic kilometer of natural gas is a measure of natural gas production and trade. Some definitions cite volume, others energy content. Dependan
Foot-poundal
The foot-poundal (symbol: ft-pdl) is a unit of energy, introduced in 1879, that is part of the Absolute English system of units, which itself is a coherent subsystem of the foot–pound–second system. T
Hiroshima bomb (unit)
No description available.
Erg
The erg is a unit of energy equal to 10−7 joules (100 nJ). It originated in the Centimetre–gram–second system of units (CGS). It has the symbol erg. The erg is not an SI unit. Its name is derived from
Thermie
A thermie (th) is a non-SI metric unit of heat energy, part of the metre-tonne-second system sometimes used by European engineers. The thermie is equal to the amount of energy required to raise the te
Kilokaiser
The Kaiser (K) is a unit of energy. A common form is kiloKaiser (kK). 1 kK = 1000 cm−1. ( cm−1, wavenumber or inverse wavelength.) This unit is most commonly used with respect to energy transitions be
Dekatherm
A dekatherm (dth) is a unit of energy used primarily to measure natural gas. It is a combination of the prefix for 10 (deca, often with the US spelling "deka") and the energy unit therm. There is some
Milliwatt hour
No description available.
Hartree
The hartree (symbol: Eh or Ha), also known as the Hartree energy, is the unit of energy in the Hartree atomic units system, named after the British physicist Douglas Hartree. Its CODATA recommended va
Gasoline gallon equivalent
Gasoline gallon equivalent (GGE) or gasoline-equivalent gallon (GEG) is the amount of an alternative fuel it takes to equal the energy content of one liquid gallon of gasoline. GGE allows consumers to
Foot-pound (energy)
The foot-pound force (symbol: ft⋅lbf, ft⋅lbf, or ft⋅lb ) is a unit of work or energy in the engineering and gravitational systems in United States customary and imperial units of measure. It is the en
Therm
The therm (symbol, thm) is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU), and approximately 105 megajoules, 29 kilowatt-hours, 25200 kilocalories and 25.2 thermies. One the
Foe (unit)
A foe is a unit of energy equal to 1044 joules or 1051 ergs, used to express the large amount of energy released by a supernova. An acronym for "[ten to the power of] fifty-one ergs", the term was int
Kilowatt-hour
A kilowatt-hour (unit symbol: kW⋅h or kW h; commonly written as kWh) is a unit of energy: one kilowatt of power for one hour. In terms of SI derived units with special names, it equals 3.6 megajoules