Which of the following describes an instance of Convection heat transfer?

Heating a pot of water on a stove is a prime example of convection heat transfer. In this process, the heat from the stove warms the bottom of the pot, which in turn heats the water in contact with it. As the water heats up, it becomes less dense and rises to the surface, while cooler, denser water descends to replace it. This continuous movement creates a convection current, effectively transferring heat throughout the water.

Convection occurs in fluids, such as liquids and gases, where the movement of the particles facilitates the transfer of heat. This is distinct from the other options, which involve different methods of heat transfer. Feeling warmth from a campfire is primarily due to radiation; touching a light bulb and feeling heat also involves conduction; and heat radiating from the sun is purely a form of radiant energy transfer. These methods do not involve the movement of a fluid medium in the same way that convection does.