5.154

SECTION 5

TABLE 5.26 Thermal Conductivity of Various Solids

All values of thermal conductivity,

k , are in millijoules cm

1

1

1

. To convert to mW · m

1

1

m, divide

· s

· K

· K

values by 10. For values in millicalories, divide by 4.184.

Substance

t, C

k

Asphalt

20

7.447

Basalt

20

21.76

Bauxite

600

5.56

Boiler scale

66

13.1

Brick, common

20

6.3

Blotting paper

20

0.628

Cardboard

20

2.1

Cement, Portland

90

2.97

Chalk

20

9.2

Chemical elements,

see

Table 4.1

Coal

0

1.69

Concrete

20

9.2

Cork, sp. grav.

0.2

30

0.54

Cork meal

100

0.556

Cotton, sp. grav.

0.081

0

0.569

Diatomaceous earth

20

0.54

Ebonite

0

1.58

Eiderdown

20

0.046

Feathers (with air)

9

0.238

Feldspar

20

23.4

Felt (dark gray)

40

0.623

Fire brick

20

4.6

Flannel

60

0.148

Flint

20

10.0

Glass, crown

12.5

6.82

flint

12.5

5.98

Jena

22

9.50

quartz

0

13.89

100

19.12

soda

20

7.1

100

7.5

Granite

20

34.2

Graphite, sp. grav.

1.58

50

441.4

Graphite powder, sp. grav.

0.7

40

11.92

Gypsum

0

13.0

Horse hair, sp. grav.

0.172

20

0.510

Ice

23.8

Leather, cowhide

84

1.76

Linen

20

0.879

Magnesia brick

20

11.3

1130

30.1

Marble, white

32.6

Mica

41

3.60

Naphthalene

0

3.77

Paper

20

1.3

Paraffin

0

2.88

Plaster of Paris

20

2.93

Porcelain

95

10.38

Quartz, parallel to axis

0

136.0

100

90.0