Right right. Volume is irrelevant here because we aren’t talking about water, yet. We are talking about ice, which is less dense than water so the mass is the only thing that matters.
And an aside here. God, base ten and the metric system are so beautiful in their simplicity. I live in the US and it pains me that we are so stubborn about adopting it. 1 liter of water weighs 1 Kilogram. 10 millimeters to a centimeter. What’s not to like?
OK.
1 Moses cube=21 grams=.021 kilograms=.021 liters of water.
To raise the temperature of the Moses cube(0 C) to the temperature of the human body(37 C) it takes an increase of 37 degrees C.
It takes 1 calorie to increase the temperature of 1 liter of water by 1 degree Centigrade therefore it takes .021 calories to raise the temperature of .021 liters of water 1 degree Centigrade.
To raise .021 liters of water by 37 degrees Centigrade it takes:
(37 degrees)(.021 calories)= 0.777 calories
If you ate 1 kilogram of ice you would burn 37 calories. And pee a lot.