<P> The "megaton (of TNT)" is a unit of energy equal to 4.184 peta joules . </P> <P> The kiloton and megaton of TNT have traditionally been used to describe the energy output, and hence the destructive power, of a nuclear weapon . The TNT equivalent appears in various nuclear weapon control treaties, and has been used to characterize the energy released in such other highly destructive events as an asteroid impact . </P> <P> A gram of TNT releases 2673--6702 J (joules) upon explosion . The energy liberated by one gram of TNT was arbitrarily defined as a matter of convention to be 4184 J, which is exactly one kilocalorie . </P> <P> An explosive's energy is normally expressed as the thermodynamic work produced by its detonation, which for TNT has been accurately measured as 4686 J / g from a large sample of air blast experiments, and theoretically calculated to be 4853 J / g . </P>

How much energy is released in the explosion of one gram of tnt
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