Detailed Instructions: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Q: The most common SI units for density are g / cm and kg / m .
A:
The SI unit of kilogram per cubic metre ( kg / m ) and the cgs unit of gram per cubic centimetre ( g / cm ) are probably the most commonly used units for density .