# Energy per Mass

The SI units used to define energy per mass (specific energy) is joules per kilogram, J/kg

Factors in **boldface** are exact.

Convert | From | To | Multiply | Std |
---|---|---|---|---|

kilojoule per kilogram | kJ/kg | J/kg | 1000 |
2 |

megajoule per kilogram | MJ/kg | J/kg | 1.0 x 10^{6} |
2 |

British thermal unit per pound (avoirdupois) | (Btu_{rr}/lb)^{1} |
J/kg | 2326 |
1 |

decatherm per pound (avoirdupois) | dT/lb | J/kg | 2.326 x 10^{9} |
2 |

1: BS 350:2004 Table 38

2: BS 350:2004 Section 37

3: BS 350:2004 Table 15

4: BS 350:2004 Table 1

5: BS 350:2004 Table 38 & BS 350:2004 Section 15

- The Fifth International Conference on the Properties of Steam (London, July 1956) defined the International Table calorie as 4.1868 J. Therefore the exact conversion factor for the International Table Btu is 1.055 055 852 62 kJ. Note that the notation for International Table used in this listing is subscript ‘‘IT’’. Similarly, the notation for thermochemical is subscript ‘‘th.’’ Further, the thermochemical Btu, Btu
_{th}, is based on the thermochemical calorie, cal_{th}, where calth = 4.184 J exactly.