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25. We introduce the notion of density,
/
mV
ρ
=
, and convert to SI units: 1000 g = 1 kg,
and 100 cm = 1 m.
(a) The density
of a sample of iron is
()
3
33
1 kg
100 cm
7.87 g cm
7870 kg/m .
1000 g
1 m
§·
§
·
==
¨¸
¨
¸
©¹
©
¹
If we ignore the empty spaces between the closepacked 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
26
29
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This note was uploaded on 09/03/2009 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.
 Spring '06
 Stoler
 Physics

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