Convert Calories (cal) to Megajoules (MJ)
Enter a value below to convert Calories (cal) to Megajoules (MJ).
Conversion:
1 Calories (cal) = 0.000004184 Megajoules (MJ)
How to Convert Calories (cal) to Megajoules (MJ)
1 cal = 0.000004184 mj
1 mj = 239005.73614 cal
Example: convert 15 Calories (cal) to Megajoules (MJ):
25 cal = 0.0001046 mj
Calories (cal) to Megajoules (MJ) Conversion Table
| Calories (cal) | Megajoules (MJ) |
|---|---|
| 0.01 cal | 4.184e-8 mj |
| 0.1 cal | 4.184e-7 mj |
| 1 cal | 0.000004184 mj |
| 2 cal | 0.000008368 mj |
| 3 cal | 0.000012552 mj |
| 5 cal | 0.00002092 mj |
| 10 cal | 0.00004184 mj |
| 20 cal | 0.00008368 mj |
| 50 cal | 0.0002092 mj |
| 100 cal | 0.0004184 mj |
| 1000 cal | 0.004184 mj |
Calories (cal)
Definition
A calorie (cal), also known as a small calorie or gram calorie, is defined as the amount of heat energy needed to raise the temperature of one gram of water by one degree Celsius. It equals approximately 4.184 joules.
History
The calorie was first defined by French chemist Nicolas Clément in 1824. It was widely used in chemistry and physiology before the joule became the official SI unit of energy.
Current use
Small calories are used in chemistry and physics for heat measurements. In everyday language, 'calorie' often refers to the kilocalorie (kcal) when discussing food energy.
Megajoules (MJ)
Definition
A megajoule (MJ) is a unit of energy equal to 1,000,000 joules (10⁶ J). It is used to express large-scale energy quantities.
History
The megajoule became commonly used with the growth of industrial energy measurement in the 20th century, particularly for fuel energy content and large engineering systems.
Current use
Megajoules are used to express the energy content of fuels (e.g., natural gas, gasoline), industrial process energy, and large-scale thermal systems in engineering and environmental science.