Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

This property diverges in metals with magnetic impurities as the temperature tends to absolute zero, an example of asymptotic freedom known as the Kondo effect. The von Klitzing constant observed in the quantum Hall effect takes the units of this electrical property, and allows for it to be measured extremely precisely. A braided Litz wire must be used to counter this property's increase in AC circuits due to the skin effect. In AC circuits, this is the real quantity added to the reactance to calculate the impedance. For 10 points, name this electrical property whose SI unit is the ohm, which measures a circuit element's opposition to the passage of current.
Science