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The density of a material is defined as the mass per unit volume.
The units are  =  kilograms/meter3  =  kg/m3
 It’s a measure of how tightly the atoms of a material are packed.   It has nothing to do with the hardness of the material.
 The pressureP, is defined as the ratio of force to area:
The units of pressure are:  Newtons/meter2  = N/m2 = Pascals  =  Pa

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