Final answer:
A flow network diagram traces the path from a source of production to a transfer point by representing the flow of a quantity, such as energy or material, through a system.
Step-by-step explanation:
A flow network diagram traces the path from a source of production to a transfer point by representing the flow of a quantity, such as energy or material, through a system. In the case of a production flow network, the source represents the starting point where the production begins, and the transfer point represents the endpoint where the production is transferred to another location. The diagram uses arrows to represent the flow of production from the source to the transfer point, and the quantity of production is indicated by the thickness or width of the arrows. For example, a wider arrow may indicate a larger quantity of production flowing through a particular path in the network.