A unit can be a measure of length. It is one-dimensional. A squared unit can be a measure of area. It is two-dimensional. A cubic unit can be a measure of volume. It is three-dimensional.
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A linear unit is used to measure length or distance whereas a cubic unit is used to measure volumes. A cubic unit may defined as a cubic measure (eg a litre) or it could be composed of three linear units (eg cubic centimetre), or a square unit and a linear one (acre-foot). This last combination is rare in the SI system because the linear units are more easily linked to square and cubic units.
You can only express ratios between things which use exactly the same units. Centimetre is a length unit. Cubic Centimetre is a volume unit
The "cubic centimeter" is a unit of volume.
A cubic line is in a cube shape line. and Parabola is a straight line
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