reactivity

/ˌriækˈtɪvəti/
noun
  1. The tendency of a substance to undergo a chemical reaction.
    • Sodium is known for its high reactivity with water.
    • Scientists studied the reactivity of the new compound in the lab.
    • The reactivity of the metal made it dangerous to handle without protective gear.
  2. The quality of responding strongly or quickly to something.
    • The teacher noticed the child's high reactivity to loud noises.
    • The patient's reactivity to the medication was monitored closely.
    • His emotional reactivity often led to arguments with his friends.
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