Convert kilocalorie (th) to attojoule
Please provide values below to convert kilocalorie (th) [kcal (th)] to attojoule [aJ], or Convert attojoule to kilocalorie (th).
How to Convert Kilocalorie (Th) to Attojoule
1 kcal (th) = 4.184e+21 aJ
Example: convert 15 kcal (th) to aJ:
15 kcal (th) = 15 × 4.184e+21 aJ = 6.276e+22 aJ
Kilocalorie (Th) to Attojoule Conversion Table
| kilocalorie (th) | attojoule |
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Kilocalorie (Th)
A kilocalorie (kcal) is a unit of energy equal to 1,000 calories, commonly used to measure the energy content of food and beverages.
History/Origin
The kilocalorie originated in the 19th century as a unit to quantify heat energy, especially in nutrition and thermodynamics. It was widely adopted in the early 20th century for dietary energy measurement.
Current Use
Today, the kilocalorie is primarily used in nutrition to express the energy content of food and drinks, although it is often simply called a 'calorie' in everyday language.
Attojoule
An attojoule (aJ) is a unit of energy equal to 10^-18 joules.
History/Origin
The attojoule was introduced as part of the SI prefixes to measure extremely small amounts of energy, particularly in fields like nanotechnology and quantum physics, as the need to quantify very tiny energy scales grew.
Current Use
The attojoule is used in scientific research to measure minute energy quantities, such as in nanotechnology, quantum computing, and molecular biology, where energies involved are extremely small.