
26-1
Electrical resistivity is a key physical property of all materials. It is oen necessary to accurately measure
th
e
re
sistivity
of a gi
ven
ma
terial
. e el
ectrical
re
sistivity
of di
erent
ma
terials
at ro
om
te
mperature
ca
n
va
ry
by ov
er
20 or
ders
of ma
gnitude
. No sin
gle
te
chnique
or in
strument
ca
n
me
asure
re
sistivities
ov
er
th
is
wi
de
ra
nge
. i
s
ch
apter
de
scribes
a nu
mber
of di
erent
ex
perimental
te
chniques
an
d
in
stru-
ments
fo
r
me
asuring
re
sistivities
. e em
phasis
is on ex
plaining
ho
w
to ma
ke
pr
actical
me
asurements
and avoid common experimental errors. More theoretical and detailed discussions can be found in the
sources listed at the end of ...