Question

Express calorie in Joules.

Answer 1

1. The calorie was originally defined as the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1° Celsius.
2. Joule is the SI unit of heat.
3. Conversion between calorie and joule is given as
4. $1$ calorie = $4.418$Joules

Hence, $1$ calories can be expressed as $4.418$Joules.