How many Hiroshimas is that?

Well, that turns out to be a unit of energy which GNU unit (my favorite shell utility) doesn't have, nor does it have kilotons (or tons) of TNT).

However I've found a calculator that does do kilotons of TNT:

http://lectureonline.cl.msu.edu/~mmp/conversions/conv_energy...

So one Ferrari is 37.13 * 10^6 kilotons. Hiroshima was 15 kt, so one Ferrari contains the energy released in 2,475,333.3 Hiroshima atomic bombs.

And for reference, 1 kilotonTNT is:

4.200e+12 joule

1.003e+12 calorie

1.003e+9 kilocalorie

At 3600 kcal/lb fat, one kilotonTNT is equivalent to 278,611.11 lb of fat. Which is to say, if everyone (313 million people) in the US lost 1/5 of an ounce each, the energy released would be equivalent to one Hiroshima bomb.

3.978e+9 BTU

1,167 MWh, or 1.2 GWh. Roughly the energy a large generating plant produces in an hour. Which is to say that the time over which you release energy matters.

And you've also inspired me to figure out how to add my own units definitions, so now I have kttnt:

686 barrels of oil, almost exactly 100 tons of oil, 1.16 GWh, 143 toncoal, 154 tons of charcoal, or about 51 grams of pure uranium.

And checking: 100 tons / 51 grams is 1,778,793, which is to say, atomic energy has roughly 1 million times the energy storage density of our best chemical energy sources.

You'll note that 100 tons of oil is a lot less than a kiloton (1000 tons) of TNT. Turns out that what makes TNT so special isn't its energy content but the rate of release of that energy. Oil (or aviation fuel as the occupants of 120 Cortlandt St., NYC, discovered a few years back) has about 10 times the energy content of explosives, it just delivers it over a longer period of time.