What is Calorie?
The '''calorie''' is a pre-[[International System of Units|SI unit]] of [[Energy#Scientific energy|energy]], [[Synonym|synonymous]] with [[heat]].{{cn|date=December 2024}} A '''calorie''' is defined as the amount of energy required to raise the [[temperature]] of one [[gram]] of [[water]] ([[specific heat capacity]] = 4,184 J kg<sup>-1</sup> K<sup>-1</sup>)<ref>{{cite web |website=U.S. Geological Survey (USGS) |title=Specific Heat Capacity and Water {{!}} U.S. Geological Survey |url=https://www.usgs.gov/special-topics/water-science-school/science/specific-heat-capacity-and-water |date=June 6, 2018 |access-date=December 1, 2024}}</ref> by one '''[[Kelvin|K]]''' (= °C + 273).<ref>{{cite web |website=[[Britannica]] |title=Kelvin (K) {{!}} Definition & Facts |url=https://www.britannica.com/science/kelvin |date=October 21, 2024 |access-date=December 1, 2024}}</ref> ==Applications== On food labels, ''calorie'' refers to '''kilocalories''' (kilo- = 10<sup>3</sup>), which equals to 1000 calories. As such, the word ''calorie'' is usually written with a capital C.{{cn|date=December 2024}} In layman terms, ''calories'' denote energy consumption. {{highlight|Think of them like the gasoline in the car. But unlike the car, the body stores the excess gas for long. The reaction to the calorie depends on which [[macronutrient]] did that calorie came from.|pink}}{{dubious|date=December 2024}}<ref>{{Cite web|last=Pareek|first=Rahul C.|date=2 July 2020|title=Understanding the basics of calories|url=https://thecalorieconscious.com/how-to-lose-weight-290-pounds-lbs/|archive-url=https://web.archive.org/web/20210225041337/https://thecalorieconscious.com/how-to-lose-weight-290-pounds-lbs/|archive-date=2021-02-25|access-date=2020-08-11|website=The Calorie Concious|language=en-US|url-status=dead}}</ref><ref>{{Cite web |url=https://www.azbukadiet.ru/sutochnaya-norma-kalorij-05-02-2023 |title=How many calories does a person need per day? |access-date=2023-02-07 |archive-date=2023-03-28 |archive-url=https://web.archive.org/web/2023032815305