Look up reactivity in Wiktionary, the free dictionary.

Generally, reactivity is something's responsiveness to stimulation, and may mean:

• 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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