I remember reading somewhere that if a unit is abbreviated as one character, there must not be a space between the number and the unit (e.g., 5m, 26K). If the unit is abbreviated as two or more ...
I have seen people say both 0.25 mile and 0.25 miles. Should we use plural or singular for a fraction of a mile?
Why are year, pound and mile in the singular form in the phrases below? five-year-old children 20 pound note 10 mile run Is that because they're acting as adjectives, which are always invariable ...