Discussion
A calorie is equal to the amount of heat required to raise the temperature of one gram of water 1°C and that difference is precised to...........................
Answer: A
The temperature interval is 14.5°C to 15.5°C.
The heat needed to warm water varies slightly with temperature, so the calorie was defined precisely as the heat required to raise one gram of water from 14.5°C to 15.5°C, the '15-degree calorie', equal to about 4.186 joules. The kilocalorie (1,000 calories) is the 'Calorie' used for food energy.
Other definitions exist, for example the mean calorie from 0°C to 100°C, but 0°C to 1°C, 20.5°C to 21.5°C and body temperature, 37°C to 38°C, are not the reference interval.
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