(between Balladonia Roadhouse and Norseman). The stretch of road between Caiguna Roadhouse and Balladonia Roadhouse is known as the 90-mile straight. It's the longest stretch of straight road in Australia, 146.6 km. of asphalt without a single curve! Towns east of Caiguna do not follow official Western Australian time.
We cannot order Social Security numbers in any meaningful way. Some people have Social Security numbers that start with a higher number than others but there is no meaningful difference signified by this. So the Social Security number is a nominal level variable. Any time that you arbitrarily assign a person or another entity an identification number, the resulting variable will be nominal because the numbers d4o not signify anything important or meaningful. On the other hand, interval level variables are ordered.
It is to be noted that in many cases the actual internal diameter deviates by several millimetres. It can only reliably be assumed that pipes from different manufacturer can be combined, if the nominal diameter DN is indicated with reference to the corresponding DIN standard. The nominal diameter is specified according to EN ISO 6708 using the abbreviation DN (Diameter Nominal) followed by a dimensionless number corresponding to the approximate internal diameter in millimetres.