Kilojoule per kilogram (kJ/kg)
Exactly 1000 J/kg, the same as one joule per gram. Used in steam tables.
What is a kilojoule per kilogram?
- Symbol
- kJ/kg
- Quantity
- Fuel Energy per Mass
- Unit system
- SI
- Definition
- Exactly 1000 J/kg, the same as one joule per gram. Used in steam tables.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used in steam and refrigerant tables for enthalpy, and for latent heat of melting and boiling.
Kilojoule per kilogram in other fuel energy per mass units
- 1 kJ/kg = 1000 J/kgJoule per kilogram
- 1 kJ/kg = 0.001 MJ/kgMegajoule per kilogram
- 1 kJ/kg ≈ 0.0002777777778 kWh/kgKilowatt-hour per kilogram
- 1 kJ/kg ≈ 0.2777777778 Wh/kgWatt-hour per kilogram
- 1 kJ/kg ≈ 0.4299226139 BTU/lbKilojoule per kilogram to BTU per pound converter
- 1 kJ/kg ≈ 0.2388458966 kcal/kgKilocalorie (IT) per kilogram
Kilojoule per kilogram quick reference
| Kilojoule per kilogram | BTU per pound | Megajoule per kilogram | Joule per kilogram |
|---|---|---|---|
| 1 kJ/kg | ≈ 0.4299226139 BTU/lb | = 0.001 MJ/kg | = 1000 J/kg |
| 10 kJ/kg | ≈ 4.299226139 BTU/lb | = 0.01 MJ/kg | = 10000 J/kg |
| 100 kJ/kg | ≈ 42.99226139 BTU/lb | = 0.1 MJ/kg | = 100000 J/kg |
| 1000 kJ/kg | ≈ 429.9226139 BTU/lb | = 1 MJ/kg | = 1000000 J/kg |
Where the kilojoule per kilogram fits
The next smaller fuel energy per mass unit is the joule per kilogram (J/kg). 1 kJ/kg = 1000 J/kg, and 1 J/kg = 0.001 kJ/kg.
The next larger fuel energy per mass unit is the BTU per pound (BTU/lb). 1 kJ/kg ≈ 0.4299226139 BTU/lb, and 1 BTU/lb = 2.326 kJ/kg.
Frequently asked questions
- How many BTUs per pound are in one kilojoule per kilogram?
- One kilojoule per kilogram ≈ 0.4299226139 BTU/lb (BTUs per pound).
- How many megajoules per kilogram are in one kilojoule per kilogram?
- One kilojoule per kilogram = 0.001 MJ/kg (megajoules per kilogram).
- How many joules per kilogram are in one kilojoule per kilogram?
- One kilojoule per kilogram = 1000 J/kg (joules per kilogram).