Final answer:
The best example of convection provided in the options would be the movement of warm air from a house into an attic. Convection represents the movement of a fluid, like air, carrying heat, and this example illustrates the concept. Hence, the correct answer is option B.
Step-by-step explanation:
Convection is defined as heat transfer through the macroscopic movement of a fluid. This process can be observed in numerous settings, including forced-air furnaces, weather systems, and household examples like warm air moving into an attic from a house. When looking at the provided options, the best example of convection is warm air exfiltrating into the attic from the house. This is because the warm air represents the fluid, which moves and carries thermal energy with it, from a region of high temperature to a region of relatively lower temperature.
The space in walls or between double-paned windows can either promote or prevent convection based on its size. Larger gaps like those in walls, especially without insulation, allow for convection, hence transferring heat more effectively. In contrast, smaller gaps, such as the space between double-paned glass, are too small for significant convection currents to form, thus reducing the rate of heat transfer.