Energy

## Btu

Btu is the abbreviation of the British thermal unit. It is a traditional unit of energy equal to about 1055 joules.

## Calorie [15 °C]

Calorie [ 15 °C] is a unit of energy that the amount of energy required to warm on gram of air-free water from 14.5 °C to 15.5 °C at standard atmospheric presure (1 cal [15°C] = 4.1855 J).

## Calorie [I.T.]

Calorie is a pre-SI metric unit of energy, symbol "cal". Calorie [i.t.] is an International Stream Table calorie equal to 4.1868 joules.

## Calorie [nutritional]

Calorie [nutritional] is a unit of energy in food.

## Calorie [thermochemical]

Calorie [thermochemical] is a unit of energy use in thermochemistry.

## Dekatherm

Dakatherm is a unit of energy eqal 10 therms, symbol "dath".

## Electronvolt

Electronvolts (symbol eV; also written electron volt) is a unit of energy equal to approximately 1.602×10^{.19} joule.

## Erg

Erg is a unit of energy and mechanical work in the the centimetre-gram-second (CGS) system of units, symbol "erg".

## Exajoule

Exajoule is a unit of energy equal to 1.0E+18 joules, symbol "EJ". This unit comes from a combination of metric-prefix "exa" and SI derived unit of energy "joule".

## Femtojoule

Femtojoule is a unit of energy equal to 1.0E-15 joules, symbol "fJ". This unit comes from a combination of metric-prefix "femto" and SI derived unit of energy "joule".

## Foot pound

Foot-pound or foot-pound force is a unit of energy in the Engineering and Gravitational System in United States customy and imperial unit of measure.

## Gigajoule

Gigajoule is a unit of energy equal to 1.0E+9 joules, symbol "GJ". This unit comes from a combination of metric-prefix "giga" and SI derived unit of energy "joule".

## Gigawatt hour

Gigawatt hour is a unit of energy equal to 1000 Megawatt hours, sysmbol "GWh". This unit comes form "giga" metric-prefix and "watt hour" unit of energy.

## Gram calorie

Gram calorie or small calorie (symbol: cal) approximates the energy needed to increase the temperature of 1 gram of water by 1 °C. This is about 4.2 joules.

## Hartree

The hartree is the atomic unit of energy, symbol (E_{h} or Ha).

## Horsepower hour

Horsepower-hour (hph) is an outdated unit of energy, not used in the SI system of units.

## Inch ounce

Inch ounce is a unit of energy equal to about 0.007061552 joule, symbol "in-oz".

## Inch pound

Inch pound is a unit of energy equal to about 0.112984829 joules, symbol "in-lb".

## Joule

Joule is a derived unit of energy or work in the International System of Units, symbol "J".

## Kilogram calorie

kilogram calorie, dietary calorie, or food calorie (symbol: Cal) approximates the energy needed to increase the temperature of 1 kilogram of water by 1 °C. This is exactly 1,000 small calories or about 4.2 kilojoules.

## Kilojoule

Kilojoule is a unit of energy equal to 1000 joules, symbol "kJ". This unit comes from a combination of metric-prefix "kilo" and SI derived unit of energy "joule".

## Kilowatt hour

The kilowatt-hour (symbolized kWh) is a unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour (1 h) of time.

## Liter atmosphere

Liter atmosphere is a unit of energy, symbole "l-atm", equal to 101.32500 joules.

## Megaelectronvolt

Megaelectronvolt is a unit or energy equal 1 000 000 electronvolts, symbol "MeV".

## Megajoule

Megajoule is a unit of energy equal to 1 000 000 joules, symbol "MJ". This unit comes from a combination of metric-prefix "mega" and SI derived unit of energy "joule".

## Megawatthour

Megawatthours is unit of energy equal to 1 000 kilowatt hours, symbol "MWh".

## Microjoule

Microjoule is a unit of energy equal to 1/1 000 000 joule, symbol "µJ". This unit comes from a combination of metric-prefix "micro" and SI derived unit of energy "joule".

## Millijoule

Millijoule is a unit of energy equal to 1/1 000 joule, symbol "mJ". This unit comes from a combination of metric-prefix "milli" and SI derived unit of energy "joule".

## Nanojoule

Nanojoule is a unit of energy equal to 1/1 000 000 000 joule, symbol "nJ". This unit comes from a combination of metric-prefix "nano" and SI derived unit of energy "joule".

## Newton meter

A newton metre is a unit of torque (also called "moment") in the SI system. The symbolic form is Nm or N·m. One newton metre is equal to the torque resulting from a force of one newton applied perpendicularly to a moment arm which is one metre long.

## Petajoule

Petajoule is a unit of energy equal to 1.0E+15 joules, symbol "PJ". This unit comes from a combination of metric-prefix "peta" and SI derived unit of energy "joule".

## Picojoule

Picojoule is a unit of energy equal to 1/1 000 000 000 000 joule, symbol "pJ". This unit comes from a combination of metric-prefix "pico" and SI derived unit of energy "joule".

## Q unit

Q units is a measure of energy system.

## Quad

A quad is a unit of energy equal to 10^{15} (a short-scale quadrillion) BTU,or 1.055 × 10^{18} joules (1.055 exajoules or EJ) in SI units.

## Teraelectronvolt

Teraelectronvolt is a unit of energy equal to 10^{12} electronvolts, symbol "TeV". This unit comes form a combination of metrix-prefix "tera" and "electronvolt".

## Terajoule

Terajoule is a unit of energy equal to 1.0E+12 joules, symbol "TJ". This unit comes from a combination of metric-prefix "tera" and SI derived unit of energy "joule".

## Terawatthour

Terawatthours is a unit of energy equal to 1000 Gigawatt hours, symbol "TWh". This unit comes from a combination fo metric-prefix "tera" and "watt hour" unit of energy.

## Thermie

Thermie (th) is a metric unit of heat energy, part of the meter-tonne-second system sometimes used by European engineers.

## Therm

The therm (symbol th) is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU).

## Tonne of coal equivalent

Tonne of coal equivalent or ton of coal equivalent (TCE) is, unit of energy, a conventional value of 7 Gcal (IT) = 29.3076 GJ.

## Tonne of oil equivalent

A ton of oil equivalent (TOE) is, unit of energy, a conventional value, based on the amount of energy released by burning one tonne of crude oil, of 41.868 GJ, 11.63 MWh, 1.28 TCE, 39.68 million BTU, or 6.6 - 8.0 actual barrels of oil (depending on actual

## Ton [explosive]

Ton [explosive] is a measure of energy.

## Watthour

Watthour (symbolized Wh) is a unit of energy equivalent to one watt (1 W) of power expended for one hour (1 h) of time.

## Wattsecond

Wattsecon (symbolized Ws) is a unit of energy equivalent to one watt (1 W) of power expended for one second (1 s) of time.