The explosive yield of a nuclear weapon is the amount of
energy, called the
yield, discharged when a
nuclear weapon is detonated, expressed usually in the equivalent
mass of
trinitrotoluene (TNT), either in
kilotons (thousands of tons of TNT) or
megatons (millions of tons of TNT), but sometimes also in
terajoules (1 kiloton of TNT = 4.184 TJ). Because the precise amount of energy released by TNT is and was subject to measurement uncertainties, especially at the dawn of the nuclear age, the accepted convention is that one kt of TNT is simply defined to be
calories equivalent, this being very roughly equal to the energy yield of 1,000 tons of TNT.
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