Ideally, when I die I want to be blown up; go out with a bang, you know? However, I wouldn't want chunks raining down on everyone.
How much TNT would I need to have secured for my funeral to completely destroy my body?
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We have discussed how much energy it takes to vaporize a person before. It is within the vicinity of three gigajoules.
Using this handy conversion table, we can see that a little less than a ton of TNT would do.
However, that is a VERY BAD IDEA™.
In 1970, some people decided to blow up a whale using half a ton of TNT. Granted, that is less than my quote for little less than a whole ton above, and whales are much larger than humans. However, the effect would be similar to what you can see in the link... A blast of TNT does not release all of its energy as heat, and even if it did, the application on your body would probably not be optimal. Little bits would be flying everywhere anyway.
Quoted from Slashdot, sources provided on the page;
First, consider the true vaporization [the complete separation of all atoms within a molecule] of water. With a simple molecular structure containing an oxygen atom bonded to two hydrogen atoms, it takes serious energy to break these bonds. In fact, it takes 460 kilojoules of energy to break just one mole of oxygen-hydrogen bonds — around the same energy that a 2,000-pound car going 70 miles per hour on the highway has in potential. And that's just 18 grams of water!
So as you can see, it would take a gargantuan amount of energy to separate all the atoms in even a small glass of water — especially if that glass of water is your analog for a person. The human body is a bit more complicated than a glass of water, but it still vaporizes like one. And thanks to our spies spread across scientific organizations, we now have the energy required to turn a human into an atomic soup, to break all the atomic bonds in a body. According to the captured study, it takes around three gigajoules to entirely vaporize a person — enough to completely melt 5,000 pounds of steel or simulate a lightning bolt.
This is obviously a lot, but how much TNT does this translate to? A metric ton of TNT contains 4.184 gigajoules of force, so we actually have some left over from removing your meaty bits. But the crater will be so big that you should probably just use a different method.
I'll just give you a factual reference:
August 2 1980, a terrorist group set a bomb in the waiting room of Bologna station: 5 kg of TNT and T4 plus 18 kg of nitroglycerine.
Of the 85 victims, one body was never found: it is believed that person was right next to the bomb when it exploded (source).
Have you considered thermite? Thermite mixes produce vast amounts of heat when ignited instead of exploding.
So perhaps the body could be packed in thousands of pounds or kilos, however much it is calculated to take, totally surrounded by thermite, and placed on a flotation device on a body of water hundreds of feet or meters, however far the safe distance is calculated to be, from land, and ignited.
According to Slashdot (Apparently they are still around), it takes 3 Gigajoules to completely vaporize a body.
According to online conversion calculators, it takes .72 tons of tnt to get 3 gigajoules.
As Renan pointed out, that's not great because the blast goes in all directions. But there are a few possibilities;