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The density of a material is defined as its mass per unit volume,

density = m/v (mass/volume)

One unit for this is grams/cm3.

The weight is 12 g, and the volume is: v = 3 cm x 2 cm x 1 cm = 6 cm3

plugging in: density = m/v = 12 g/6cm3 = 2 g/cm3

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Q: A rectangular solid is 3 cm long 2 cm wide and 1 cm high it has a mass of 12 g what is its density?
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