Hiroshima Burns 60%
Falling debris 30
Other 10

Nagasaki Burns 95%
Falling debris 9
Flying glass 7
Other 7



THE NATURE OF AN ATOMIC EXPLOSION


The most striking difference between the explosion of an atomic bomb and
that of an ordinary T.N.T. bomb is of course in magnitude; as the President
announced after the Hiroshima attack, the explosive energy of each of the
atomic bombs was equivalent to about 20,000 tons of T.N.T.

But in addition to its vastly greater power, an atomic explosion has
several other very special characteristics. Ordinary explosion is a
chemical reaction in which energy is released by the rearrangement of the
atoms of the explosive material. In an atomic explosion the identity of
the atoms, not simply their arrangement, is changed. A considerable
fraction of the mass of the explosive charge, which may be uranium 235 or
plutonium, is transformed into energy. Einstein's equation, E = mc^2,
shows that matter that is transformed into energy may yield a total energy
equivalent to the mass multiplied by the square of the velocity of light.
The significance of the equation is easily seen when one recalls that the
velocity of light is 186,000 miles per second. The energy released when a