Q: 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.
In stars it occurs when entropy increases outward. Its efficiency is measured by the Nusselt number and it's usually parameterized by a mixing-length theory which treats parcels of buoyant fluid. It occurs throughout low-mass stars and in the outer 30 percent by radius of the Sun where the magnetic field is connected to the associated fluid motions. For ten points, name this method of heat transfer.
A:
Science