Kilojoule (abbreviated as kJ) is an energy unit in the international system of units, which is used to represent energy and energy consumption in food. A kilojoule is a thousand times that of Joule, and 1 kilojoule is equal to 1000 Joule.

Kilojoules are often used to measure the energy content of food in daily life. The energy provided by the food ingested by the human body is generally in kilojoules. For example, an apple may provide 200 kilojoules of energy.

In nutrition, the daily energy intake is usually in kilojoules, which is called daily energy requirement. People of different ages, sexes, body shapes and activity levels need different energy every day.

Forefoot is also often used to describe the energy consumption of physical activity. For example, jogging 1 hour may consume 3000 kilojoules of energy. Generally speaking, kilojoule is a unit to measure energy and plays an important role in food, nutrition and physical activity.

Matters needing attention in kilojoule unit conversion

1, unit conversion: kilojoule (kJ) is the energy unit in the international system of units, and its conversion relationship with other energy units is: 1 kilojoule = 1000 joule (j), 1 kilojoule =0.239 calories (kcal).

2. Pay attention to the case of the unit: the symbol of kilojoule should be lowercase "kJ" and the symbol of joule should be capitalized "j". When converting units, we should pay attention to case sensitivity to avoid confusion.

3. Keep valid figures: When changing companies, you need to keep appropriate valid figures. According to the specific situation, you can keep 2-3 significant figures to avoid calculation errors.

4. Use correct conversion coefficient: When converting kilojoule units, make sure to use accurate conversion coefficient. For example, when converting kilojoules into joules, the conversion factor of 1000 should be used; When converting kilojoules into calories, a conversion factor of 0.239 should be used.

Reference to the above content: Baidu Encyclopedia-Qianjiao