Kilojoule
Kilojoule (kJ)
Kilojoule (pronounced: kilo-JOOL) is a unit of energy in the International System of Units (SI). The term is derived from the Greek words 'kilo', meaning thousand, and 'Joule', named after the English physicist James Prescott Joule.
Definition
A kilojoule is equal to 1000 joules. It is commonly used in scientific contexts, particularly in the field of nutrition, where it is used to measure the energy content of foods.
Usage
In the context of nutrition, the kilojoule is used to quantify the amount of energy that is released from food when it is consumed and metabolized by the body. This energy is used to fuel all bodily functions and physical activities.
In the field of physics, the kilojoule is used to measure energy in various contexts, such as the energy transferred by a force of one newton over a distance of one meter (1 Newton meter or N·m), or the energy dissipated as heat.
Related Terms
- Joule: The joule (J) is the standard unit of energy in the International System of Units. It is equal to the energy transferred to an object when a force of one newton acts on that object in the direction of the force's motion through a distance of one metre.
- Calorie: A unit of energy often used in the field of nutrition, equivalent to 4.184 kilojoules.
- Nutrition: The science that interprets the nutrients and other substances in food in relation to maintenance, growth, reproduction, health and disease of an organism.
- Physics: The natural science that studies matter, its motion and behavior through space and time, and the related entities of energy and force.
External links
- Medical encyclopedia article on Kilojoule
- Wikipedia's article - Kilojoule
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