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.

Mobility is related to the zeta potential, dielectric constant, and this quantity in the Smoluchowski equation. For gases, the variation of this quantity with temperature is given by Sutherland's formula. Measured with a Zahn cup, this quantity is squared in the Grashof number, and the ratio of this quantity to thermal diffusivity is the Prandtl number. When this quantity is zero, the Euler equations correspond to the NavierStokes equations. Reynolds number is the ratio of inertial forces to this quantity, which is constant for Newtonian fluids. Measured in poise [PWAHZ], this quantity is zero for superfluids. For 10 points, name this internal friction of a fluid that tends to resist its flow.
Science

Like the Gospel of Luke, this Biblical book begins with a dedication to Theophilus. Seven Greek deacons are appointed in this book, including a man whose stoning is ordered by the Sanhedrin. In this book, a mighty wind descends upon 120 followers fifty days after the Resurrection. When a man on the road to Damascus is blinded by holy light in this book, he decides to convert and change his name from Saul to Paul. For 10 points, name this book which describes the deeds of Jesus' followers.
Social Science

Several Hindus and Jains observe this practice in an event known as Ekadashi, which occurs roughly every eleventh day. Women may perform this action on Karva Chauth, and Mormons are asked to practice it the first Sundays of each month. In Judaism, this action occurs on the Tenth of (*) Tevet. Muslims recite the Fajr prayer before engaging in this practice, and in the evening, they end their ritual by using dates and water in an event called iftar. Jews are required to perform this action on Yom Kippur. For ten points, identify this abstention of food practiced by Muslims during the month of Ramadan.

Social Science