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 longitudinal coefficient of this phenomenon and its quadratic dependence can be accounted for by the Preisach Model. A form of Saint-Venants Principle may be applied to the helical and linear forms of this effect. It results in strain directly proportional to applied field and not proportional to the square of the field like electrostriction, its converse process. Seen prominently in barium titanate and tourmaline, and other ceramics lacking inversion centers, it was discovered in Rochelle salts by the Curie brothers. The opposite of mechanical distortion, FTP, name this effect exemplified by the production of voltage across the face of a quartz crystal in response to applied stress.
A:
Science