The formal definition of density is mass per unit volume.

Usually the density is expressed in grams per mL or cc.

Mathematically a "per" statement is translated as a division. cc is a cubic centimeter and is equal to a mL


Therefore,

Density =	mass =	g/mL
	volume

Algumas  densidades:

                            
                              Plástico850 −     1400 para Polipropileno e PET/PVC

Cobre        8,93x10³

Alumínio       2,70x10³

      

                                                                      Chumbo         11,3x10³


         Água              1,00x10³ 


                                                          Ar na presão atmosférica          0,0012x10³ 

           Plástico(para polipropileno e PET/PVC)  de 0,85 a 1,40x 10³


  Fonte: Serway, Principios de Física vol.1 e http://pt.wikipedia.org/wiki/Densidade visitado em 20/05/2011.