Density is going to factor in somewhere, sure, but when you have 100 -> 0 vs 35 -> 0, that's almost 3x more energy (given constant specific heat) you need to si

Density is going to factor in somewhere, sure, but when you have 100 -> 0 vs 35 -> 0, that's almost 3x more energy (given constant specific heat) you need to sink somewhere. a single-digit percentage is a drop in the ocean here.