Reactance is expressed as an ordinary number with the unit ohms, whereas the impedance of a capacitor is the reactance multiplied by -j, i.e., z=jx. The j term accounts for the 90-degree phase shift between voltage and current that occurs in a purely capacitive circuit. Capacitive reactance of a capacitor reduces as the frequency across its plates increases.
Therefore, capacitive reactance it’s inversely proportional to frequency. Capacitive reactance opposes current flow, but the electrostatic charge on the plates (it’s AC capacitance value) remains constant. Unlike a resistor where the opposition to current flow is its actual resistance, the opposition to current flow in a capacitor is called reactance.
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