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.
Definition: A calorie is a unit of energy, defined as the amount of energy needed to raise the temperature of one gram of water by one degree Celsius.
History/origin: The calorie was first defined in the 19th century and is often used in chemistry and physics.
Current use: Calories are used to measure small amounts of energy, often in scientific contexts and older nutrition references.
| Joules (J) | Calories (cal) |
|---|---|
| 418.400 | 100 |
| 1046.000 | 250 |
| 2092.000 | 500 |
| 3138.000 | 750 |
| 4184.000 | 1000 |
| 6276.000 | 1500 |
| 8368.000 | 2000 |
| 209.200 | 50 |
| 20.920 | 5 |
| 5163.056 | 1234 |
1 joule = 0.239 calories
1 calorie = 4.184 joules
Example: convert 2092 joules to calories:
2092 ÷ 4.184 = 500 calories