Final answer:
Determining the number of water closets on a 3in stack requires consulting plumbing codes such as the UPC or IPC, not volume calculations of solid objects. The provided formula for volume is irrelevant to plumbing capacity.
Step-by-step explanation:
The question "How many water closets can be supported by a 3in stack?" relates to the planning and installation of plumbing systems. The term 'water closet' usually refers to a toilet, and the '3in stack' refers to a three-inch diameter vertical pipe that carries waste to the sewer or septic system. To determine the capacity of the stack, one must consult plumbing codes, which are based on the volume of discharge and the stack's ability to carry that volume to waste systems.
Volume calculators (incorrectly provided in the reference) do not directly apply to this context, since they measure the physical dimensions of solid objects, not the flow capacity within pipes. Therefore, using the formula volume of stack = length x width x height is not appropriate for determining the number of water closets on a stack. Instead, one should reference the Uniform Plumbing Code (UPC) or the International Plumbing Code (IPC) for guidance. They provide tables and calculations factoring in the diameter of the pipe, the number of fixtures, and the fixture unit flow rates to provide safe and effective plumbing design.