convection

n [U] transmission of heat from one part of a liquid or gas to another by the movement of heated substances （热的）对流.

controllable, controlled, controller, controlling interest, controversial, controversialist, controversially, controversy, controvert, contumacious, contumaciously, contumacy, contumely, contuse, contusion, conundrum, conurbation, convalesce, convalescence, convalescent, convector, convene, convener (also convenor), convenience, convenience food, convenient, conveniently, convent, convention, conventional, conventionality, conventionalize, conventionalize, -ise, conventionally, conventions, converge, convergence, convergent, conversance, conversant,