The practical maximum yield-to-weight ratio for fusion weapons ( thermonuclear weapons) has been estimated to six megatonnes of TNT per tonne of bomb mass (25 TJ/kg). The yield-to-weight ratio is the amount of weapon yield compared to the mass of the weapon. Because the accuracy of any measurement of the energy released by TNT has always been problematic, the conventional definition is that one kilotonne of TNT is held simply to be equivalent to 10 12 calories. An explosive yield of one terajoule is equal to 0.239 kilotonnes of TNT.
The explosive yield of a nuclear weapon is the amount of energy released such as blast, thermal, and nuclear radiation, when that particular nuclear weapon is detonated, usually expressed as a TNT equivalent (the standardized equivalent mass of trinitrotoluene which, if detonated, would produce the same energy discharge), either in kilotonnes (kt-thousands of tonnes of TNT), in megatonnes (Mt-millions of tonnes of TNT), or sometimes in terajoules (TJ). Energy released in nuclear weapons explosions Log–log plot comparing the yield (in kilotonnes) and mass (in kilograms) of various nuclear weapons developed by the United States.
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