How to Calculate the Density of an Object

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This article will quickly show you how to calculate the density of an object. Density is basically a ratio that tells you how much matter is packed into a particular space or object. The SI unit for density is kilograms per cubic metre (kg/m³).

Things You'll Need

  • calculator
  • In order to calculate density you must first determine the volume of the object using the following formula (if the object is square or rectangular shaped, if not a modification of the volume formula must be used):
    v = l w h
    Where:
    v = volume (expressed in cubic units, such as cm³, or in mL)
    l = length
    w = width
    h = height

  • Determine the mass of the object that you want to calculate density.

  • Now, use the following formula to calculate density:
    d = m / v

    Where:
    d = density
    m = mass
    v = volume

  • The SI (International System of Units) unit for density is kilograms per cubic meter (kg/m³). For example:
    you have an object with a volume of 225 m³ and a mass of 370 kilograms. Therefore:
    d = 370/225
    d = 1.64 kg/m³

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