yes, but not if you’re talking about the specific “food calorie”. calories are unit of measuring “energy” ie heating up 1gram of water by 1 degree C. one food Calorie (notice the capital C) is 1000 calories or 1kcal. things like wood, gasoline, all have energy and can be used for things like heating up water too. we measure nonfood sources energy in BTU’s usually.
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