Joule per kilogram (J/kg)
SI unit of specific energy: energy per kilogram, for example the heating value of a fuel.
What is a joule per kilogram?
- Symbol
- J/kg
- Quantity
- Fuel Energy per Mass
- Unit system
- SI
- Definition
- SI unit of specific energy: energy per kilogram, for example the heating value of a fuel.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
The SI unit of specific energy, used in physics and thermodynamics. It also equals the gray, the unit of absorbed radiation dose.
Joule per kilogram in other fuel energy per mass units
- 1 J/kg = 0.001 kJ/kgKilojoule per kilogram
- 1 J/kg = 0.000001 MJ/kgMegajoule per kilogram
- 1 J/kg ≈ 2.777777778e-7 kWh/kgKilowatt-hour per kilogram
- 1 J/kg ≈ 0.0002777777778 Wh/kgWatt-hour per kilogram
- 1 J/kg ≈ 0.0004299226139 BTU/lbBTU per pound
- 1 J/kg ≈ 0.0002388458966 kcal/kgKilocalorie (IT) per kilogram
Joule per kilogram quick reference
| Joule per kilogram | Megajoule per kilogram | BTU per pound | Kilojoule per kilogram |
|---|---|---|---|
| 1 J/kg | = 0.000001 MJ/kg | ≈ 0.0004299226139 BTU/lb | = 0.001 kJ/kg |
| 10 J/kg | = 0.00001 MJ/kg | ≈ 0.004299226139 BTU/lb | = 0.01 kJ/kg |
| 100 J/kg | = 0.0001 MJ/kg | ≈ 0.04299226139 BTU/lb | = 0.1 kJ/kg |
| 1000 J/kg | = 0.001 MJ/kg | ≈ 0.4299226139 BTU/lb | = 1 kJ/kg |
Where the joule per kilogram fits
The next larger fuel energy per mass unit is the kilojoule per kilogram (kJ/kg). 1 J/kg = 0.001 kJ/kg, and 1 kJ/kg = 1000 J/kg.
Frequently asked questions
- How many megajoules per kilogram are in one joule per kilogram?
- One joule per kilogram = 0.000001 MJ/kg (megajoules per kilogram).
- How many BTUs per pound are in one joule per kilogram?
- One joule per kilogram ≈ 0.0004299226139 BTU/lb (BTUs per pound).
- How many kilojoules per kilogram are in one joule per kilogram?
- One joule per kilogram = 0.001 kJ/kg (kilojoules per kilogram).