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f) The ceramic tiles on the floor cannot be scratched easily by people walking
on them. This means that ceramic tiles are ____________.
g) Asbestos sheeting can be used to fireproof doors. In other words asbestos is
____________.
h) Black cloth blinds can be used to keep the light out of a room, i.e. cloth is
____________.
4. Now look at this table:
Materials Density,
kg/m
3
Melting point 0є
C
Typical tensile
strength
N/mm
2
Relative cost
Glass
Concrete
Softwood (pine)
Hardwood(oak)
Mild steel
Aluminum
Copper
Zinc
2520
2300
5500
8800
7850
2640
8950
7100
1500
-
-
-
1900
660
1083
420
60
4
40
100
450
90
340
110
12
1
6
15
9
35
25
20
Identify these materials form the table:
a) This material has a slightly lower density than aluminum.
b) This material has a much higher melting point than glass.
c) This material has a tensile strength much higher than concrete, but
slightly lower than zinc.
d) This material is slightly lighter than oak but is much stronger in tension.
e) This material has a considerably higher melting point than copper, but a
much lower tensile strength.
f) This material has a tensile strength approximately twice that of pine.
g) The melting point of this material is approximately 1 Ѕ times as high as
that of copper.
h) The density of this material is approximately half that of pine.
i) This material is ten times as strong as concrete in tension.
j) These two materials have very nearly the same tensile strength.
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