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: For a dilute gas, this quantity is proportional to the square root of the product of mass and temperature, divided by collision diameter squared times the collision integral. This quantity scales from a reference temperature, for an ideal gas, as the square root of temperature. Those results are the Chapman-Enskog equation and Sutherland's formula. This quantity varies over time in thixotropic materials and with applied shear in shear-thinning materials. This quantity, the ratio of shear stress to shear velocity, is zero for Newtonian fluids, and superfluidity occurs when this quantity is zero. For 10 points, name this property of fluids, which measures resistance to flow
A:
Science