Definition: A kilojoule is a unit of energy equal to 1,000 joules.
History/origin: The kilojoule is derived from the joule as a larger unit for convenience in measuring bigger quantities of energy.
Current use: Kilojoules are used globally in science, nutrition, and engineering for energy measurements.
Definition: A joule is the SI unit of energy, defined as the amount of energy transferred when applying a force of one newton over a distance of one meter.
History/origin: Named after James Prescott Joule, it has been adopted as the standard unit of energy worldwide.
Current use: Joules are widely used in physics, engineering, and many scientific disciplines to measure energy.
| Kilojoules (kJ) | Joules (J) |
|---|---|
| 1.000 | 1000 |
| 2.000 | 2000 |
| 5.000 | 5000 |
| 10.000 | 10000 |
| 15.000 | 15000 |
| 20.000 | 20000 |
| 0.500 | 500 |
| 0.100 | 100 |
| 7.500 | 7500 |
| 12.300 | 12300 |
1 kilojoule = 1000 joules
1 joule = 0.001 kilojoules
Example: convert 2.5 kilojoules to joules:
2.5 × 1000 = 2500 joules