Final answer:
A pipe nipple is a short piece of pipe with male threads on both ends. It is used to connect two pipes or fittings together. It can be used to join pipes of the same size or pipes of different sizes.
Step-by-step explanation:
A pipe nipple is a short piece of pipe with male threads on both ends. Its purpose is to connect two pipes or fittings together. It can be used to join pipes of the same size or pipes of different sizes.
For example, if you have a 4-inch pipe and an 8-inch pipe, you can use a pipe nipple to connect them together.
Pipe nipples are commonly used in plumbing systems, oil and gas industries, and in various industrial applications.