The expression method of pipe sizes, inch (inch) is the length unit used in the United Kingdom (UK, the United Kingdom (Commonwealth) and its former colonies, generally 1in=2.54cm, in the British system, 12 inches is 1 foot, 36 An inch is 1 yard. In building materials, the unit of inch is used to refer to pipes, which is 2.54 cm instead of market inches.
