The SI unit of measurement for length is the metre. Its symbol (not abbreviation) is m.
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No, although a centimetre is a unit of length, the meter (m) is the SI base unit for length. 1 cm = 0.01m. Not only isn't it a base unit, it's not even an SI unit! In the SI system, multiples are based on 10 raised to the power of multiples of 3. So, whereas a millimetre, is an SI unit, a centimetre is not -although, of course, it is a metric unit.
The unit for mass is the kilogram; its abbreviation is kg.
The basic unit for length in SI is the meter.
The basic SI unit of length is the meter.
By unit of length and distance and conversion ,we can say that base unit of length for the si system is m.