Thermal Energy
Thermal energy is defined as the total kinetic and potential energy of all of the molecules and atoms making up a substance. The SI unit for thermal energy is the Joule (J). However, thermal energy is also measured in calories and kilocalories. 1 kilocalorie = 1,000 calories, and kilocalorie is often written as Calorie (with a capital C). A food Calorie is a kilocalorie.
1 food Calorie = 1 kilocalorie = 1,000 calories = 4,184 Joules
1 food Calorie = 1 kilocalorie = 1,000 calories = 4,184 Joules