quantity of heat; calorific value
Technical term for the amount of heat energy, often measured in calories, joules, or BTU. Used in physics, engineering, and nutrition.
The calorific value of this food is 350 kilocalories per 100 grams.
Figurative extension: the intensity of someone's passion or enthusiasm, as if measuring emotional heat.
His speech had extraordinary passion.
I burned calories by exercising.
I could feel his passion from the presentation.
This menu item is high in calories.
He is pouring his passion into this project.