Calories, that is, cards and kcals (large cards), are units of energy. A card is the energy needed to raise one gram of water by one degree. Food energy is usually calculated in kilocalories, also known as big cards.
According to international units, energy should be expressed in joules. 1 joule = 4.182 card, then 1 kcal = 4.182 kJ. Sometimes this unit is used to indicate the energy in the food. Most of the time, people use the kilocalorie unit to calculate the energy in the food because it is more convenient.
Thousands of calories = calories
Thousands of cards = big calories
1 kcal = 1000 calories
1 kJ = 1000 calories
1 kcal 1 big calories 1 calorie = 1000 calories
1 kcal / 1 kcal / 1 calorie (kcal) = 4.184 kJ (kJ)
1 card = 4.182 joules
4.182 kJ = 1 calorie
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