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); the imaginary component of AC impedance
• 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

• Reactants, chemical reagents
• Reactivity (disambiguation)

This disambiguation page lists articles associated with the title Reactance.
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