High Quality Content by WIKIPEDIA articles! In nuclear physics and chemistry, the Q value for a reaction is the amount of energy released by that reaction: Q = Eleft(text{Reactants}right) - Eleft(text{Products}right), A reaction with a positive Q value is exothermic (has a net release of energy), while a reaction with a negative Q value is endothermic (requires a net energy input). Q values are also featured in particle physics. For example in Sargent's rule, which states that the reaction rate of weak interactions is proportional to Q5. The Q value is the kinetic energy released in the decay of the particle at rest.

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