Which method involves air or fluid movement for heat transfer?

Convection is the method that involves the movement of air or fluid to transfer heat. This process occurs when warmer fluid, which has a lower density, rises, while cooler, denser fluid moves down to replace it. This constant movement creates a circulation pattern that efficiently distributes heat.

In the context of heating systems, for example, hot air can rise and distribute warmth throughout a room as it displaces cooler air. This is distinct from conduction, which involves direct heat transfer between materials that are in contact with each other, and radiation, which involves heat transfer through electromagnetic waves without needing a medium. Insulation, on the other hand, serves to reduce heat transfer rather than facilitate it. Hence, the method that specifically focuses on heat transfer through the movement of air or fluid is indeed convection.