10k by 10k 10k by 10k
Not much, 1Kg is subcritical.
One kilogram of aluminum has a mass of one kilogram. It's weight is one kilogram. It's volume would be .37L, and it's density would be 2.70 kg/L
Approx. 10 kg of plutonium 239.
The Little Boy bomb had not plutonium.
750 kilograms at a price of $3.60 per kilogram would cost $2,700.
Nuclear weapons with plutonium don't contain TNT.
Approx. 4 000 US $ for weapon-grade plutonium.
Approx. 4ooo US $ per gram for nuclear weapons quality plutonium; the price for nuclear reactors grade plutonium is lower.
Because of its' mass density. The lead would be much smaller in size.
1 plutonium (solid) gallon = 71,337 kg
4.14¹ ^ 15 J
That would depend on the buoyancy of the feathers.