One calorie is equal to how many joules?

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Multiple Choice

One calorie is equal to how many joules?

Explanation:
A calorie is defined as the amount of energy needed to raise the temperature of 1 gram of water by 1 degree Celsius at standard pressure. That value is 4.184 joules, so one calorie equals 4.184 J. The other options don’t match that conversion: 1 J is too small, 0.0002389 kJ is about 0.2389 J, 1000 J is 1 kJ, and a kilocalorie (the food Calorie) is 4184 J, not 4.184 J.

A calorie is defined as the amount of energy needed to raise the temperature of 1 gram of water by 1 degree Celsius at standard pressure. That value is 4.184 joules, so one calorie equals 4.184 J. The other options don’t match that conversion: 1 J is too small, 0.0002389 kJ is about 0.2389 J, 1000 J is 1 kJ, and a kilocalorie (the food Calorie) is 4184 J, not 4.184 J.

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