The standard sized cremation urn
used for the cremains of all persons of any size as well as the ashes of the coffin and its accouterments the person is cremated with can contain 200 cubic inches of volume:
The cremation industry has a standard volume size for an individual cremation urn, which holds 200 cubic inches of ashes. Unless otherwise noted, all of our individual cremation urns are 200 cubic inches in volume capacity.
So it is safe to assume that the average volume of any individual's cremains is less than 200 cubic inches. So the cremains of 900,000 persons would be less than 180,000,000 cubic inches = 2950 cubic meters.
An Olympic size swimming pool is 50 meters long by 25 meters wide by 2 meters deep = 2500 cubic meters.
So the cremains of of 900,000 persons is less than 2950 cubic meters - which is about the volume of an Olympic size swimming pool.
It is being alleged in this thread that the ashes of the fuel (being assumed to be mostly wood) used to burn 900,000 persons plus the remains of those burnt 900,000 persons would require a volume of 6 times the volume of an Olympic size swimming pool - or about 6 times what the cremains (plus coffin and accouterments) would amount to.
Scientific studies listed in wikipedia
This is the dry mass of the wood (without water) being referenced here.
A University of Wisconsin study
Test results for unit weight or bulk density (ASTM C 29) for wood fly ash exhibited average density value of 548 kg/m3 (34.2 lb/ft3). It ranged from 162 to 1376 kg/m3 (10.1 lb/ft3 to 85.6 lb/ft3). For wood bottom ash the average was 827 kg/m3 (51.6 lb/ft3).[/url]
So the density of ash here falls within the range 162 to 1376 kg/m3.
An Olympic swimming pool volume (2500 m3) of ash would then weigh between:
(162 to 1376) kg/m3 * 2500 m3 = (405,000 to 3,440,000) kg = (405 to 3440) tonnes.
If one were to only consider the dry weight of that wood leading to that much ash, this weight of ash would correspond to:
(405 tonnes / 0.0182) to (3440 tonnes / 0.0043) = (22,253 to 800,000) tonnes
So 5 Olympic size swimming pools would contain the ashes of (111,265 to 4,000,000) tonnes dry wood.
So it is being claimed that an average of (123 to 4,444) kg of wood (the dry weight - w/o water) per corpse was used for 900,000 corpses.
The 123 kg figure is assuming that the wood used has the property of the highest percentage of ash output (1.82 percent - I used 1% in a former post) and that ash being the lightest ash of all (162 kg/m3 density - I used 1,000 kg/m3 in a former post).
The seasoning of the wood probably doesn't matter much because the water does not contribute to the ash output but merely evaporates out into the air.
So find a wood that burns to 1.82% ash (weight) and whose ash has a density of a mere 162 kg/m3 and I'll allow that using IT
to burn corpses would result in IT'S
ashes being 5 times the volume of the corpse cremains - and therefore 900,000 corpse's cremains and wood ashes would fill 6 Olympic size swimming pools.
For normal assumptions, it'd be 1 or 2 Olympic size swimming pools.
Even Gerdes claims T-II's ashes should've been about 4,000 m^3 (and he thought he was estimating high!) with his NAFCASH crapola. I guess I've just given him reason to change that!
He'll soon be changing it to: If exotic woods were used, the ash volume could be as high as 15,000 m^3!
EDIT: I didn't even bother to convert the dry weight to the wood's actual weight here - as you can see.
EDIT 2: How 6 meters comes into play here is anyone's guess? I think one needs to be drunk to see that. Maybe I'll see that this weekend!