Answer :
Final answer:
Heat transfer in liquids and gases primarily takes place through conduction and convection, with convection being the more dominant process in fluids. Therefore, the correct option is B) Convection only.
Explanation:
Heat transfer in liquids and gases occurs through two primary methods: conduction and convection. Conduction involves the transfer of heat through direct contact between molecules. In fluids such as liquids and gases, this process is often much less efficient than convection, which is the movement of heat by the actual flow or circulation of the fluid.
For instance, when a pot of water is heated from the bottom, the water molecules at the bottom gain energy and move faster, becoming less dense, and rise to the top. The cooler, denser water then moves down to take its place, creating a convection current that helps distribute the heat. This is different from radiation, which is the transfer of energy through electromagnetic waves and does not require a medium.
Therefore, the correct option for the question on how heat transfer occurs in liquids and gases is B) Convection only.
