The SI unit is the kilogram per meter (kg/m).
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The mass per unit of linear density is the amount of mass per unit length of a linear object, such as a string or wire. It is calculated by dividing the total mass of the object by its length.
Density is the amount of mass in a given volume.The symbol most often used for density is p (the lower case Greek letter rho). Mathematically, density is calculated as mass divided by volume (p = m/V).
Density = Mass/ volume
The measure of how much mass there is in a volume of a substance is known as the density. It is defined as the mass of a substance per unit volume. Density is often expressed in units such as grams per cubic centimeter (g/cm3) or kilograms per liter (kg/L).
density
Density = mass of an object divided by the volume of that object. Its unit is mass per unit volume.