위키
Nutrition[edit]
In nutritional contexts, the kilojoule (kJ) is the
SI unit of food energy. However, calorie and kilocalorie are still in common use.
[7]In these contexts, confusingly, the word "calorie" and "kilocalorie" refer to equivalent units (the former to the large calorie and the latter to 1000 small calories). Sometimes, in an attempt to avoid confusion, the large calorie is written as "Calorie" (with a capital "C"). This convention is not always followed, and not explained to the average person clearly.
These quantities are often used for the total amount of food energy (e.g., in a meal) and for the
specific energy, namely amount of energy per unit of mass (e.g. "calories per gram", "calories per serving"). Nutritional requirements or intakes are often expressed in calories per day.
Chemistry[edit]
In scientific contexts, the term
calorie almost always refers to the small calorie. Even though it is not an SI unit, it is still used in chemistry. For example, the energy released in a
chemical reaction per
mole of reagent is occasionally expressed in
kilocalorie per mole.
[8][9] This use is largely due to the ease with which it can be calculated in laboratory reactions, especially in aqueous solution; a volume of reagent dissolved in water forming a solution, with concentration expressed in moles per liter (1 liter weighing 1 kg), will induce a temperature change in degrees Celsius in the total volume of water solvent, and these quantities (volume, molar concentration and temperature change) can then be used to calculate kcal/mol. It is also occasionally used to specify energy quantities that relate to reaction energy, such as
enthalpy of formation and the size of
activation barriers. However, its use is being superseded by the SI joule unit.
-다른 사이트 - 까먹음.
Our calculators give you the option of calculating in either calories (kcal) or kilojoules (kJ). If you've never heard of kilojoules, you won't need to worry about them
-또 다른사이트 weightlossresources.co.uk
In scientific terms:
1000 calories = 1 kilocalorie = 1 kcal = the energy it takes to raise the temperature of 1kg of water by 1°C.
In nutrition terms:
ie. What you'll find on food packaging, calories = kilocalories and are used interchangeably.
In some instances food energy is measured in kilojoules - mostly by the scientific community - though some food packaging also gives kilojoule (kJ) values. 1 kilocalorie = 4.2 kilojoules.
번역까지 해주기는 귀찮음.
대충 요약 (그리고 안퍼온 기타 소스에 의하면)
칼로리(cal) 의 단위 자체가 죵나게 눈꼽만하게 작아서 음식(영양) 관련에서는 calorie(=Kcal)가 기본 단위(정확히는 stand unit)이다. 화학식에서는 cal과 kcal을 정확하게구분해서 쓴다. 굳이 말하면 영양학에서는 kJ(KiloJoule) 이라는 단위를 쓴다.
추가 :
유럽에서는 kcal을 쓰고 미국에서는 cal을 쓴다. (즉 유럽의 1000 calories = usa 1 calorie)
그리고 이거 검색하다 안건데 미국의 billion과 유럽의 billion은 단위가 다르다는군요.
미국 : 1,000,000,000
유럽 : 1,000,000,000,000
...뭐야 이거
또 추가.
Cal과 cal로 따지고 싶으시면 대문자 ㅋ 만들어주시던가
(굳이 따지자면 애초에 Cal도 맞는것도 아니고)
작성일 : 13-11-19 06:42
조회 : 580
