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The statement 4 is one eighth of a set is telling us that there is a set that contains eight different items (sets can contain other things than numbers, for example, they can contain other sets) and one of those items is the number 4.
measurement of volume.
biometrics
Trade will become impossible. Things will not fit together.
Years are a measurement of time, miles are a measurement of distance. Miles cannot be broken down into years because miles and years measure different things.