A dimension in a system of units is something like length, weight or time, without considering how to assign numerical values ot them, which requires units of measurement such as the meter, kilogram or second.
Talking about dimensions can be useful when explaining new derived units without worrying about the exact units involved. See e.g. this table: en.wikipedia.org/w/index.php?title=Lumen_(unit)&oldid=1233810964#SI_photometric_units
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A unit of measurement is a standard quantity used to express and quantify physical properties. Units of measurement provide a way to communicate measurements consistently and universally. They are essential in various fields such as science, engineering, commerce, and everyday life. Units can be classified into different categories, including: 1. **Length**: Measured in meters (m), kilometers (km), miles, and inches.