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Reactivity may refer to:

  • Reactivity (chemistry), the rate at which a chemical substance tends to undergo a chemical reaction
  • Reactive programming, a property of an execution model whereby changes are automatically propagated through a dataflow network
  • Reactivity (psychology), a phenomenon which occurs when subjects alter their performance due to their awareness of being observed
  • Nuclear chain reaction, a basic parameter describing kinetics and dynamics of nuclear reactors

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