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ch01_p23 - 23 We introduce the notion of density = m V and...

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23. We introduce the notion of density, / m V ρ = , and convert to SI units: 1000 g = 1 kg, and 100 cm = 1 m. (a) The density ρ of a sample of iron is therefore ( ) 3 3 1 kg 100 cm 7.87 g cm 1000 g 1 m § · § · = ¨ ¸ ¨ ¸ © ¹ © ¹ ρ which yields ρ = 7870 kg/m 3 . If we ignore the empty spaces between the close-packed spheres, then the density of an individual iron atom will be the same as the density of any iron sample. That is, if M is the mass and V is the volume of an atom, then
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