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That is the accepted size of a given pipe. If you use precise enough measurements, it will vary very slightly. If you say a pipe is 1 1/2 inches, everyone knows what you mean and it is close enough for practically any operation.

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Q: What is the nominal external and internal diameter?
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Related questions

What is external diameter?

The diameter is the measurement of a line that goes right through a circle, through the centre point. In cases where we have a ring or some other such object with multiple circles, we would have an external diameter and an internal diameter. The internal diameter is the diameter of the inner circle. The external diameter is the diameter of the outer circle.


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