[Basileus]

As far as the napalm goes, I think it's liters, or a close approximation thereof. 250 liters is about 63 gallons, and early napalm tanks were modified fighter plane drop tanks which held 75 gallons. Later, jet fighters like the F-4 carried much larger napalm tanks, 150 gallons or so. By weight, I believe 75 gallon tanks were around 500 pounds full (250 liters of water would be 250kg or 550lbs) and 150 gallon tanks would be double that. Since napalm is semi-solid, it should be lighter than pure liquid, and dedicated napalm canisters were relatively thin-walled as a result

Basileus