Beginner Topic 412 of 1102 Thermodynamics & Energetics
Calorie vs Joule
One thermochemical calorie equals 4.184 joules.
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In-depth explanation of Calorie vs Joule
The calorie is a historical unit of energy, and one thermochemical calorie is defined as exactly 4.184 joules. The nutritional Calorie, written with a capital C, equals 1000 calories, which is one kilocalorie, or about 4.184 kilojoules. Chemistry and physics use joules as the SI unit, but nutrition labels still commonly show Calories for convenience. Converting between the units is a simple multiplication by 4.184, but confusing the calorie with the Calorie can lead to an error of a factor of 1000. Keeping both units in mind prevents misreading energy values.
Going deeper: Calorie vs Joule
Key ideas: One calorie equals 4.184 J exactly, and one food Calorie equals 1 kcal. Convert by multiplication or division by 4.184. Energy values on food labels in kJ and kcal are both given in many countries.
Common mistakes and connections: The capital letter matters, and mixing calorie with Calorie causes thousandfold errors. Do not use the older 15-degree calorie when the thermochemical calorie is specified. The conversion connects daily nutrition with thermochemical data such as heats of combustion.
Visualization of Calorie vs Joule
Energy units in joules: one thermochemical calorie is 4.184 J, and a nutritional Calorie is 1000 times larger, 4184 J. The interactive lesson shows this as a live animation or chart.
Worked example and use case
A 2000 Calorie diet corresponds to about 8.4 megajoules per day, since 2000 times 4.184 kilojoules equals 8368 kilojoules.
Frequently asked questions about Calorie vs Joule
What is Calorie vs Joule?
One thermochemical calorie equals 4.184 joules.
Is Calorie vs Joule a beginner, intermediate or advanced topic?
Calorie vs Joule is a beginner topic in Thermodynamics & Energetics. It needs no earlier chemistry lessons and is a good starting point.
What should I learn before Calorie vs Joule?
Study these earlier topics in Thermodynamics & Energetics first: Exergy, Joule Experiment, Standard Conditions.
What comes after Calorie vs Joule?
The next topics in Thermodynamics & Energetics are Heat of Fusion of Ice and Heat of Vaporization of Water.
Can I practise Calorie vs Joule with quizzes?
Yes. The interactive lesson includes a self-check question on Calorie vs Joule, and the Thermodynamics & Energetics quiz draws on every topic in this area.
Where Calorie vs Joule fits in Thermodynamics & Energetics
Calorie vs Joule is topic 84 of 91 in Thermodynamics & Energetics.