Actually, if you have an accurate graduated cylinder, you can measure the displacement of the volume of water and calculate it at 1 gram per millimeter which is also a cubic centimeter of water. Actually, I have the means to do that. Scale and graduated cylinders. Also three presumably different coal brands on hand. No name, Kimmle's and Blaschak. If I'm really bored tonight. I'll dry samples in a low oven and do the calculations.
Just for giggles and to extend this thread to 9 pages!
Then Fred will have to come west and visit both of us!!!
Or would that be south???