Wikipedia:Styletips/9
Unit symbols: spacing
Values and unit symbols are separated by a space (preferably a non-breaking space):
- Correct: 5 min, 3 lb, 90 °C
- Incorrect: 5min, 3lb, 90°C
Only angular and coordinate degrees, and the percent sign, are unspaced:
- 90° (a right angle), 76%