A convective heat transfer is a: heat transfer at a molecular level heat exchange between two fluids through a separating wall heat transfer by electromagnetic waves heat exchange between the wall and the fluid washing overit

The correct answer is: heat exchange between the wall and the fluid washing over it.<br /><br />Convective heat transfer refers to the transfer of heat by the movement of a fluid (liquid or gas) over a surface. This type of heat transfer occurs when there is a temperature difference between the fluid and the surface, causing the fluid to move and carry heat away from the surface. The fluid motion, driven by buoyancy forces, creates a convective flow that facilitates the heat transfer. This is different from heat transfer at a molecular level (conduction), heat exchange between two fluids through a separating wall (conduction), and heat transfer by electromagnetic waves (radiation).