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.
Q: The dioptric form of this is the degree to which an optical system causes light to converge or diverge. This property of a statistical test is the probability the test will not commit a Type II error. The electrical form of this is equal to the integral of the Poynting vector over an area. The volumetric flow rate times pressure gives this in fluid systems. The integral of this quantity yields work, and this word is sometimes used in place of exponent. Name this, the rate at which work is performed or energy converted, with the watt as its SI unit.
A:
Science