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658 19 PROCESSES AT SOLID SURFACES
20 40 60 80
0.70
0.75
0.80
0.85
0.90
p/kPa
(p
/V
)/
(k
Pa
cm
−3
)
Figure 19.4
0.0 0.1 0.2 0.3 0.4
4
5
6
7
z
y/
(1
0−
3
cm
−3
)
Figure 19.5
�e data are a good �t to a straight line with equation
y/(10−3 cm−3) = 9.939 × (z) + 3.329
�e parameter c is found using
slope
intercept
= c − 1 hence c = 1 + 9.939
3.329
= 3.99
�e intercept is 1/cVmon, therefore
Vmon =
1
c × (intercept)
= 1
3.99 × 10−3 × (3.329 cm−3)
= 75.3 cm3
P19B.8 Note: there is missing data from this Problem, which is that the two tempera-
tures referred to are 400 ○C and 500 ○C.