Calorie (Cal for short), transliterated from English Calorie, is defined as the heat required to raise 1 gram of water to 1 degree Celsius at 1 atmospheric pressure; Calorie is an energy unit, which is still widely used in nutrition measurement and fitness manual. The international standard unit of energy is joule. As an international unit of heat, Europe widely uses joules, while the United States uses calories. Although Joule is a unit of heat in the International System of Units, calories are still widely used in Chinese mainland and Taiwan Province Province for traditional reasons.

Calories are units of energy. We often associate calories with food, but in fact they apply to anything that contains energy. For example, 4 liters of gasoline contains about 3 10/00000 calories. With the heat in the 2 17 Big Mac, you can drive 35 kilometers.

Simply put, 1 calorie of energy or heat can raise the temperature of 1 gram of water by 1 degree Celsius at one atmospheric pressure. 1 calorie is approximately equal to 4. 186 joules (joules are commonly used units of energy in physics).

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 g of water by one degree Celsius at1atmospheric pressure, which is equivalent to the internal energy of 4 186 joules. (1000 calories = 1 calories). So, actually, 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 to 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.

I hope it can help you solve the problem.