Calories, abbreviated as card and cal, are transliterated from English. It is defined as the heat required to raise 1 gram of water to 1 degree Celsius at 1 atmospheric pressure; Calorie is a kind of calorie unit, which is widely used in nutrition measurement and fitness manual. The international standard unit of energy is joule.

As the legal unit of food calories, joules are widely used in Europe, while calories are used in the United States. Although Joule is the legal unit in China, calories are still widely used in Chinese mainland and Taiwan Province provinces due to tradition.

Extended information Most of us associate calories with what we eat or drink, such as "This soda contains 200 calories". In fact, the calories listed on food packaging are calories, and the capital letter C is also marked, which is equivalent to the heat required to raise 1 000 grams of water from 14.5 degrees Celsius to 15.5 degrees Celsius at1atmospheric pressure, which is about equal to the internal energy of 4 186 joules. (1000 calories = 1 calories).

So, in fact, this can of soda contains 200,000 calories (but don't worry, it also applies to exercise-when the exercise chart says that you jog for 2 kilometers and burn 100 calories, it is 100 calories).

In English, "calorie" (lowercase) means calorie, which is about 4. 186 joules, and "calorie" (uppercase) means calorie, which is about 4 186 joules.