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Reactance may refer to:

  • Electrical reactance, the opposition to a change in voltage due to capacitance (capacitive reactance) or in current due to inductance (inductive reactance)
  • Magnetic reactance, a similar effect in magnetism
  • Reactance (psychology), an emotional reaction to pressure or persuasion that results in the strengthening or adoption of a contrary belief
  • Reactivity (chemistry), the rate at which a chemical substance tends to undergo a chemical reaction

See also[edit]