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Table 362. Vapor Pressure and Rate of Evaporation

# Table 362. Vapor Pressure and Rate of Evaporation

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OF M E T A L S *

T A B L E 363.-EVAPORATION

363

For the range of pressures for which the corresponding values of t"C are given in the

table (Part 2), the pressure as a function of T(=t

273) may be represented to a satisfactory degree of approximation by the relation

logp=A-BB/T.

(1)

Part 1 gives values of A and B used in calculating the values of t"C in Part 2, where

p is expressed in microns of mercury. The symbols (s) and ( I ) refer to the solid and

liquid states, respectively.

The rate of evaporation is given by the relation

+

+

+

log W = 3.7660 0.5 log M log p - 0.5 log T

(2)

= c log p - 0.5 log T,

(3)

where W is expressed in g cm-' sec-', and f~ in microns.

E x p l a i d o n of data b t Pavt 2.-The first row for each metal, which is designated t ,

gives the temperatures in "C corresponding to the pressures in microns a t the head of

each column. These were calculated by means of equation 1. The second row, designated

W , gives the rates of evaporation (in a good vacuum) in grams per square centimeter

per second ( g cm-' sec-'), at the values of t immediately above in the same column. These

were calculated by means of equation 3.

In addition to the values of t given in the first row, which are to be regarded as, in

the writer's opinion, the more reliable, there are also given, in the case of a number of

the metals, a series of other values of f, which have been observed by some investigators:

The fact that for the same value of the vapor pressure in microns two or more values of

t are quoted by different authorities indicates the degree of uncertainty that exists for

some of the data given in the tables. For metals for which the data are very questionable,

it has not been considered worth while even to calculate values of W .

The column headed t , gives the melting point in degrees C, and pm gives the vapor

pressure in microns a t the melting point. For values of t below tm, the metal is obviously

in the solid state, and for values of t above t,, the metal is in the liquid state.

+

Prepared by Saul Dushnian, General Electric Research Laboratory, Schenettady, N. Y.

P a r t 1.-Constants

Metal

Li .........

Na ........

K .........

Rb ........

A

10.50(1)

10.71 (1)

10.36(1)

10.42(1)

[ 10.53(1)

Cs ........ 9.86(1)

[ 10.02(1)

........

Cu

10-3 x B

7.480

5.480

4.503

4.132

4.2911

3.774

3.8831

in relations for evaporation of metals

c+4

.1867

.4468

S621

,7319

...

.8278

...

12.81(s)

11.72(1)

........ 12.28is)

11.66(1)

........ 11.65(1)

........ 12.99(s)

11.95(1)

....... 11.82(s)

18.06

16.58

14.85

14.09

18.52

18.22

16.59

7.741

.6678

........ 11.30(s)

........ 11.13(s)

........ 10.88

........ 11.94(s)

........ 11.78(s)

B ......... 14.13(s)

A1 ........ 11.99(1)

s c ........ 11.94

Y ......... 12.43

9.055

8.324

8.908

6.744

5.798

S675

.7373

.8349

.6737

.7914

Ag

Au

Be

Mg

Ca

Sr

Ba

Zn

Cd

La

Ce

Ga

In

TI

C

........ 11.88(1)

........

........

.........

.........

.........

13.74(1)

10.79(1)

10.93(1)

11.15(1)

14.06(s)

...

.7825

...

.9135

.2436

...

.4590

21.37

15.63

18.57

21.97

18.00

.2831

.4814

S931

.7405

.8374

20.10

13.36

12.15

8.92

38.57

.8392

.6877

.7959

.9212

.3056

SMITHSONIAN PHYSICAL TABLES

13.20(s)

12.55(1)

11.25Csj

11.98(1)

12.38(s)

13.04(1)

12.52(1)

10.94(1)

xB

19.72

18.55

18.G4

20.11

25.87

27.43

28.44

15.15

9.97(1)

10.69(1)

13.32

14.37(s)

13.00(s)

13.11

9.60

26.62

40.40

40.21

.8032

.9242

.6195

.7500

,8947

Sh, ........ 11.42

Bi ......... 11.14(1)

Cr . . . . . . . . 12.88(s)

Mo ........ 11.80(s)

W ........ 12.24(s)

9.913

9.824

17.56

30.31

40.26

.9592

.9260

.6240

17570

.8983

......... 12.88(1)

........ 12.25(s)

........ 12.63(s)

13.41 (I j

Co ........ 12.43

Ni ........ 13.28(s)

25.80

14.10

20.00

21.40

21.96

21.84

20.60

........ 13.50

........ 13.55

........ 11.46

0 s ........ 13.59

I r ......... 13.06

Pt ........ 12.633

33.80

30.40

19.23

37.00

34.11

27.50

hfetal

Si

.........

Ti

.........

Zr

........

Th

Ge

........

........

........

........

Sn

Pb

V .........

Nh ........

Ta . . . . . . . .

A

U

Mn

Fe

12.55(1)

Ru

Rh

Pd

(coritirtrrcd)

10-8

CS-4

.4900

.4m

.6061

...

...

.7460

.9488

.6965

.9544

.6359

.6395

.65 12

5503

,7696

,7722

.7801

.9056

.9089

.9112

T A B L E 363.-EVAPORATION

Part 2.-Temperatures

O F M E T A L S (continued)

for given values p i n microns of mercury and rates of evaporation (W, g cm-2 sec-I)

p(pHg)

10-2

10-1

100

1000

tm

roc:

.P

439

5 . 7 6 lo-"

~

467

514

5.48x10-5

541

607

5.18x10-'

632

725

4.87x10-'

745

9x10-'

W

. . .:

t "C:

377

6.03x10-'

406

179

b

325

6.28x lo-*

353

Na

..........a

roc:

64

9.8x lo-'

88.5

2.84x10-e

99

74

3.61X10d

79

1035

1.29X10"

848

1.81XlOd

265

1.57x10-3

217

2 . 4 3 lo-'

~

230

207

3.07~10-3

211

437

1.05x 10-2

338

1.48x10-*

59.4

2.%X 10-T

70

45

3.77xlO-'

50

29 1

1.18X lo-4

207

1.67x 10.'

165

2.58xlO-'

177

153

3.18x10-'

158

8.2x lo-'

t"C :

238

1.24x 10"

161

1.75x10-5

123

2.71 x 10.'

135

110

3.44x

115

98

...........a

195

1.29XlOd

123

1.83x 10."

356

1 . 1 21~o - ~

K

158

1.35x10-T

91

1.91x10-T

38.5

1.5XlOA

29

1.5x104

1141

1 . 2 4 lo-'

~

1273

1.18X 10-4

1432

1 . 1 3lo-'

~

936

1.74~10-~

1316

2.05x 10-6

1130

4.68x lo-'

383

1.12x 10-~

528

1.31x10-5

594

475

2.00x 10"

1047

1 . 6 7 lo-'

~

1465

1.96x lo-'

1246

4.49x10-5

443

1.08X lo-4

605

1 . 2 5lo-'

~

680

549

1.91x lo-'

1184

1.59x10-'

1646

1.87x10-3

1395

Metal

Ref.'"

.......... .a

Li

Rb

Cs

..........d

W:

U7 :

t "C:

W:

C

t"C :

......... .e

t "C:

U' :

C

t "C:

cu ....... . f , c

roc:

..........a

roc:

Au

......... .a

roc:

1083

2.22~10-7

Be

........c, g

t"C :

Mg

.........a

t "C:

942

5 . 0 310.'

~

287

1.21xio-'

Ca

..........a

t "C:

h

t"C :

Sr

..........c

Ag

1%

W:

W:

W:

W:

W:

W:

roc:

W:

For references, see p. 367.

946

1.33x lo-'

767

1.88xIo-T

1 . 4 2 10.'

~

462

1190

2.14 x

1029

4.86x lo-'

331

1.17 x lo-'

463

1.37x

523

361

2.17x10-'

413

2.08x10"

408

1

10

(corrtinried)

515

1.02~10-3

700

1.19x 10-8

784

639

1.81x10-*

283

2.29)<10-'

297

277

2.87)<10-'

280

1628

1.07x lo-'

1353

1.50x lo-'

1083

.31

%1

1.78

1867

1.77~10-~

1582

1063

1284

6x10-3

19.5

605

9.71x 10-3

817

1.12x lo-?

651

2.2~103

810

8.75x102

750

1.71x lo-'

771

1.44x109

...

T A B L E 363.-EVAPORATION

Metal

Ref.

......... .c

Ba

I

j

P(/rHg)

10-2

10-1

O F M E T A L S (continued)

1

10

100

1000

t"C:

W:

t"C:

t"C :

418

2 . 6 0 10-7

~

485

476

476

2.5ox 10-6

549

544

546

2.39~10-5

625

626

629

730

858

2 . 2 8 ~ 1 0 - ~ 2 . 1 6 ~ 1 0 - ~ 2.03X10-'

861

716

829

726

85 1

...

t"C :

:

211

2.15x

248

2.07x10-a

292

1.98)<10-'

343

1.90x lo-'

405

1.81 lo-'

h

tn

717

76.

Zn

.......... a

Cd

..........a

roc:

W:

148

180

3 . 0 1 ~ 1 0 - ~ 2.91)<10-"

220

2.79x

264

2.67x 10.'

321

2.54x10-'

.........k

t"C:

IY:

-23.9

-5.5

5 . 2 3 ~ 1 0 - ~ 5.5ox 10-6

18.0

4.84x10-'

48.0

4.6ix10-~

82.0

4.39~10.~

126

4.14X lo-'

-38.9

2.5X104

B

...........c

t"C:

IY:

1052

5.27x lo-'

1239

4.94X10"

1355

4.76x lo-'

1489

4 . 5 7 ~10-4

1648

4.38>(10-'

20002080

...

Al

......... .a

724

805

9.60x10-'

9.21 ~ 1 0 - 7

843

929

9 . 0 7 ~ 1 0 - ~ 8.74>(10-'

889

8.88x lo-'

1030

8.40X lod

996

8.51 x10-'

1148

8.04x10-s

1123

8.11 x10-'

1291

7.66x10-'

1279

7.69XlO4

1465

7.27X10J

660

1.2x

c, 1

t"C :

IV:

t"C :

660

1.8x 10.'

......... .c

t"C :

W:

1058

1.07~

1161

1282

1 . 0 4 ~ 1 0 - ~ 9.94~10-"

1423

9.51~10-'

1595

9.07~

1804

8.40x10-'

1397

Y

...........c

t"C :

It.':

1249

1.41>(10-'

1362

1 . 3 6 lo-"

~

1494

1.31x

1649

1.25~

1833

1.2ox10-9

2056

1.14X lo-'

1477

La

........ ..c

t"C:

W:

1023

1.91

1125

1.81x10-".

1242

1.77x10-5

1381

1.69x10-'

1549

1.61 lo-'

x

1754

1.53x10-'

887

2.3x10'

Ce

..........c

t"C :

W:

1004

1 . 9 3 lo-'

~

1091

1 . 8 7 lo-'

~

1190

1 . 8 0 lo-'

~

1305

1.74x10-'

1439

1.67X104

1599

1 . 6 0 lo-*

~

785

5.5x10-6

W:

t"C:

771

1.51x10-'

859

1.45x 10-O

1093

1.32x

1248

1.25x lo4

1443

1.18x lo-'

30

0

1.38x10-'

t"C :

W:

667

2.04x lo-'

746

1.96X 10"

840

1.87x1O4

952

1.79x10-'

1088

1.69~10-'

1260

1.60x lo-*

157

0

t"C:

405

3 . 2 0 lo-'

~

461

3.08XlO-'

527

lo-'

2.95~

606

2.81X1O4

702

2.67X1O4

821

2.52x

304

5.Ox lo-'

Hg

sc

Ga

..........c

tn

........c, m

TI

..........a

1v

W:

W:

1140

5.11x10-'

965

x

...

...

...

...

419

1.6X102

321

1

.ox102

6.6

.76

G,

(continwd)

G

v)

2

I

v)

0

zD2

T A B L E 363.-EVAPORATION

I

0

<

I?

Ref.

Metal

c ...........c

D

m

r

Ln

m

10-2

10-1

1

10

100

1000

1V:

2129

4.1 3x 1O-'

2288

4 . 0 0 10.'

~

2471

3.86x lo-'

2681

3.72x

2926

3.58X104

3214

3.42X 10'

tn

Si

...........c

PC :

w:

1024

8.58x10-*

1116

8 . 2 9 10-7

~

1223

7.99X 10.'

1343

7.68x1O4

1485

7.37~10-4

1670

7.01X10-8

1410

31.6

Ti

......... .c

PC:

1134

1.08xlO-'

1249

1.04 10-'

x

1384

9.92X10-8

1546

9.47~

1742

9.0Ox lo-*

1965

8.53X10-3

1727

84.3

Zr

......... .c

w:

roc:

w:

1527

1.31x10-'

1660

1.27><10"

1816

1.22x10-6

2212

2001

1 . 1 7 ~ 1 0 - ~ 1 . 1 2 10-3

~

2459

1.07x lo-*

2127

40.7

Th

......... .c

t"C :

w:

2.01

1831

1 . 9 4 lo-'

~

1999

1.86~

2196

1.79x10-'

2431

1.71x lo-'

2715

1.63><10-2

1827

9.3x lo-*

Ge

..........c

PC :

w:

897

1.45

x

996

1 . 4 0 10.

~'

1112

1.34X10"

1251

1 . 2 7w4

~

1421

1.21x 10.'

1635

1.14X lo-*

959

4.5x10-*

Sn

..........c

t"C.

W:

823

1.92x 10-

922

L84x 10.'

1042

1.75x

1189

1.66><10-'

1373

1.57X1O5

1609

1.47x10-*

232

0

Pb

.......... a

t"C :

483

548

3 . 0 5 ~ 1 0 ~ ~2.93x10-'

625

2 . 8 0 10-5

~

718

2.67x10-'

832

2.53x lo-'

975

2 . 3 8 lo-'

~

328

5.4x10-'

w:

1465

1 . 0 10-7

~

1586

9.6x

1725

9.3X10"

1888

8.9X104

2079

8.6x10-4

2207

8.2x 10"

1697

.65

PC:

2194

1.16x10-7

2355

1.08~10-'

2539

1.06X

2500

.6

2407

1.55x 10"

2599

1.48x10-'

2820

1.41x lo-'

2996

5.0

466

3.35x

525

3.22x10-'

595

3.09x 10"

678

2 . 9 5 lo-'

~

779

2.81x lo-'

904

2.65X

630

2.82

474

3 . 0 8 10-7

~

536

296x104

609

2.84XW

698

2.71x

802

2.57x lo-'

934

2.43X lo-"

271

1 . 2 0 10-7

~

907

1 . 2 210-7

~

992

1.18x lo-'

1090

1.14X

1205

1.09~

1342

1.05xlo-"

1504

1.oox10-2

1900

6.35X104

c)

r

P

4

P(PHSJ

roc:

OF M E T A L S (continued)

v .......... .c

Nb

.......... n

Ta

.......0, p

Sbz

......... C

Bi

......... .C

Cr

........c,

1

w:

roc:

W:

t"C:

W:

t"C :

W:

t"C:

W:

roc:

W:

1686

x 10-7

(cotltinued)

T A B L E 363.-EVAPORATION

fl(pHg)

in

10-1

10-2

O F M E T A L S (concluded)

1

10

100

1000

h

tm

t"C :

W:

1923

1.29~10-7

2095

1.18X10"

2295

1.12 10-6

x

2533

1 . 0 5 lo-'

~

2622

22.0

t"C:

l,v:

2554

1 . 4 7 lo-'

~

2767

1.46x10-'

3016

1.45 lo-'

x

3309

1.43x lo-'

3382

17.5

t"C :

1461

2.16x10-'

1585

2 . 0 9 lo-'

~

1730

2.01x10-6

1898

1.93x 10"

2098

1.85xlo-'

2338

1.76x lo-'

1132

3.24~10-'

W:

t"C :

W:

717

1.38x10-'

791

1 . 3 2 10.'

~

878

1.27x

980

1 . 2 2lo-'

~

1103

1.17 x 10.'

1251

1.11x 10-2

1244

9.O4X1O2

f

t"C:

W:

1094

1.29x lo-'

1195

1.20x10-'

1310

l.lOx10-~

1447

1.02~10-4

1602

1.01x10-~

1783

9 . 6 lo-'

~

1535

co . . . .. . .. . .c

t"C:

W:

1249

1.15 10"

x

1362

1.11x lo-'

1649

1494

1 . 0 6 ~ 1 0 - ~ 1.02~10-4

1833

9.76x10-'

2056

9.28X10J

1478

.76

Mn

Fe

.... ... . . c

. . ... . . . c ,

37.2

Ni

. .... ...c,

q

t"C :

W:

1157

1 . 1 8 10.'

~

1257

1.14x10-'

1371

1. l o x 10-6

1510

1 . 0 610-4

~

1679

1.01x lod

1884

9.62~10-'

1455

4.37

Ru

.. . ... .. . .c

t"C:

W:

1913

1.26x10-'

2058

1.22x10-6

2230

1.18x10-'

2431

1.13>(104

2666

1.08)<10-'

2946

1.04x lo-*

2427

9.8

Rh

..... .. . .. c

roc:

1681

1.34x10-'

1815

1.29x10-'

1971

1.25x10-5

2149

1.2ox 10-4

2358

1.15x10-a

2607

1.1ox 10-2

1967

1.0

W:

Pd

. . . . . . . . . .c

t"C:

1156

1.59x lo-'

1271

1.53x10-'

1405

1.47x 10.'

1566

1.41x lo-'

1759

1.34x lo-*

2000

1.26x 10.'

1555

8.71

W:

0 s

. . . . .:. . . .c

t"C:

:

cv

2101

1.65x lo-'

2264

1.60X 10"

245 1

1.54X lo-'

2667

1.48x10-'

2920

1 . 4 2 lo-'

~

3221

1.36~10-~

2697

Ir

.... .... . .. c

t"C :

W:

1993

1.70~

21 54

1.65xlo-'

2340

1.59x 10.'

2556

1.52x10-'

281 1

1.46x lo-'

31 18

1.39XlO-'

2454

3.55

Pt

... . . ... ..c

t"C :

1606

1.BX 10-7

1744

1.81X10"

1904

1.75x10-6

2090

1.68X1O4

2313

1.60x10-'

2582

1.52~10-~

1774

.16:

W:

References: a, Kelley, K. K., Bur. Mines Bull. 383,

modynamic and physical properties of the elements, Repi

f , M,

Langmuir. I.. Phys. Rev., vol. 51, p. 753, 1937.

R., and Garrett A. B., Journ. .\mer. Chem. Soc., vol.

J. A. M., Rec. h v . Chem. d. Pays-Bas. vol. 55. p. 461

Tables, vol. 3, p. 306, 1928.

I. Baur, E.. and Bruner,

n, Reimann, A. L., and Grant, C. K.. Philos. Mag., vol.

Rev. vol. 61, p. 513 1942.

q. Johnston, H. L., and

s, Jones,

G. M. J., Phys. Rev.,'vol. 30, p. 201, 1927.

13.5

c. Brewer, T h e therh, Ditchhurn, R. W., and Gilmour, J..C., Rev. Mod. Phys., vol. 13. p. 310, 1941.

e, Taylor, J. B., and

for the Manhattan Project, 1946.

d, Killian, T. J., Phys. Rev., vol. 27, p. 578, 1926.

g. Schumann,

hall, A. L., Dornte, R. W., and Norton, F. J., Journ. Amer. Chem. Soc., vol. 59. p. 1161, 1937.

i. .Van Liempt.

h, Rudberg, E., Phys. Rev., vol. 46, p 763. 1934.

p. 442, 1944. vol. 67. p. 2279, 1945.

k,

Int.

National

Critical

j,

RLdherg,

E.,

a

n

d

Lempert,

J.,

Journ.

Chem.

Phys.,

vol.

3.

p.

627,

1935.

1936.

m, Anderson, J. S.. Journ. Chrm. Soc. (London), vol. 141. 1943.

., Hev. Chim. Acta, vol. 17. p. 958, 1934.

o, Langmuir, D. B., and Maker, L., Phys. Rev., vol. 55. p. 748. 1939.

p, Fiske, M. D.. Phys.

!, p. 34 1936.

r, Jones, H. A., Langmuir, I., and Mackay,

arshall.' A. L., Journ. Amer. Chem. Soc., vol. 62. p. 1382, 1940.

A,, and Langmuir, I., Gen. Electric Rev., vol. 30. p. 354, 1927.

35.

TABLE 364.-VAPOR

368

PRESSURE OF ORGANIC LIQUIDS

The vapor pressures on this page are in mmHg over a liquid phase unless distinguished by the

subscript .. They are generally means from various determinations.

"C

-90

-57

-40

-30

-20

-10

Benzine Camphor

CaHe CioHisO

Acetone

CaHeO

.02

...

...

...

...

...

...

...

...

116

...

0

+li

15

20

30

40

50

60

70

80

90

100

110

120

130

140

150

185

283

422

612

860

1190

1860

2140

2800

3590

4550

5670

6970

...

...

200

Ethylene

CiHi

"C

-150

-190

-145

-135

-130

-120

-110

-103

14.9

45.6

26.7

74.4

117.2

260

519

792

...

...

...

.06

...

.10

...

.J

...

14

26.5

34

45

59

75

.15

119

26

182

.60

269

1.30

390

2.6

548

4.6

750

9.2

...

1010

1340

26

1740

...

2200

2800

...

...

3500

4300

170

...

...

"C

118

24

161

6.5

175 13

190 32

220 100

260 385

-70;

,

...

...

119

212

353

559

848

1229

1720

form

CIICI.

i:*8 -70";')

l9

...

-241

0

25.4

49.75

80.1

99.9

125.9

-101.3"

.058>

-

,l:;">

61.0 - 75"

... 1500

...

100

...

160

247

370

540

750

1025

1400

2130

2420

...

3900

4000

6000

7300

Methyl ether

(CHa)iO

"C

- 67

- 60

- 41.4

- 30.9

Ethyl

Ethyl Turpen.

ether Iiromide

tine

C,HloO C2HaBr CioHo

Ethane

C2Hs

10900

(continued)

SMITHSONIAN PHYSICAL TABLES

Chloro-

} -60:-} 8. -l&}

.14

390

-50:9z}

,341 ...

...

80

33

127

43

160

198

56

71

244

298

90

433

141

213

617

315

855

348

1170

1570

620

843

2040

2620

1120

1460

3000

1880

4160

2390

5150

3000

3700

4500

9100

-25"

Methane

CHI

"C

-180

-175

-170

-165

-160

-155

-150

Carbon

tetrachloride

CCI.

...

...

625

c(Iyly;e

Carbon

bisulfide

CS2

78

120

326

524

782

2.52 atm

6.05 "

11.2 "

22.1 "

32.1 "

51

"

186.1

...

291.8

...

...

...

...

...

...

...

...

...

442.4

648

921

1276

1728

2294

2991

3840

4860

...

...

...

...

...

...

...

...

...

7500

. ..

11080

g;}

180"'

218001

Naphthalene

CI&

"C

o

.oz.

20

.06.

50

.81,

4.0,

70

80 10

90 13

100 20

110 29

120 43

150 119

200 490

...

...

59

102

166

207

257

317

386

564

802

1113

1510

2015

2640

3400

4310

5390

6660

8120

9780

...

...

...

...

...

...

.2

...

.3

.3

.4

.7

1.1

1.7

2.6

4.1

6.1

9.0

13.1

18.6

25.7

34.9

...

...

...

...

...

Ethvl chloride

CTHaCI

"C

--3n

-20

-10

0

10

20

30

50

75

100

iin

iSS

302

465

691

1000

1400

2850

4980

8720

T A B L E 364.-VAPOR

"C

-50

-30

-25

-20

-15

-10

-5

0

+1;

15

20

25

30

35

40

45

50

60

70

80

90

100

Ammonia

NHa

atm

.403

1.180

1.4%

1.877

2.332

2.870

3.502

4.238

5.090

6.068

7.188

8.458

9.8%

11.512

13.321

15.339

17.580

20.060

25.80

32.69

40.90

50.56

61.82

Cragoe

1920

Carbon

dioxido

co2

atm

Hydrogen

Ethyl , sulfide

acetate

HIS

mm

mm

...

...

...

...

6.74

14.10

16.61

19.44

22.60

26.13

30.05

34.38

39.16

44.41

50.17

56.50

63.45

71.4

...

...

...

...

...

...

...

...

...

...

...

...

4100

12.9

5720

24.3

7750

...

...

...

...

42.7

...

72.8

...

108.5

1216

2840

6.5

...

...

41.5

53.5

68.6

(I.C.T.

1928)

369

PRESSURE OF ORGANIC LIQUIDS (concluded)

Ethyl

iodide

C2Hd

mm

...

lOi00

14000

...

167.6

...

119

17500

...

186

...

22000

282

415

... 596

. _ . 833

... 1130

... 1515

27500

...

250

362

510

Methyl

chloride

CHsCl

mm

...

579

718

883

1079

1310

1579

1891

2250

2660

3134

3667

4267

4940

5700

6650

...

8510

10900

40400 14300

. . _ 16800

... 21000

Napthalin

CioHs

mm

...

...

...

...

...

...

...

...

...

...

...

...

...

...

...

...

...

...

...

...

9.6

13.0

Sulfur

dioxide

so2

mm

Toluol

CIOHS

&

"C

mm

-91.9

-81.7

-77.4

-67.5

. .. -57.7

760 -38.0

. . . -24.2

1155 - 2.9

.002

.005

.007

.020

86

286

379

474

iji4

. ..

...

2460

3420

46%

0

+KO

+25.8

. ..

...

...

...

.060

.39

1.47

5.72

6.86

16.8

28.7

...

...

...

...

...

6210

8150

10540

...

...

{1;E;

T A B L E 365.-VAPOR

PRESSURE A T L O W TEMPERATURES

Many of the following values are extrapolations made by Langmuir by means of plots

of log p against I/T. 1 barye = 0.000000987 atm = 0.000750 mmHg.

Gas

"C

0,

. .......... -182.9

Nt

. .......... -195.8

-211.2

-210.5

co .......... -190

-200

CH, .......... -185.8

-201.5

A . .......... -186.2

-194.2

CzH, .......... -175.7

-188

-197

-205

CsHa .......... -150

-180

-190

-198

SMITHSONIAN PHYSICAL TABLES

mmHg

Gas

760

7.75

760

86

863

249

79.8

50.2

760

300

.76

.076

.0076

.00076

7.6

.076

.0076

.00076

COs

...........

"C

-148

-168

-182

-193

Ice ............ - 60

- 75

- 89

-100

-110

Hg

- 40

- 78

-180

Baryes

100

1

.01

.0001

9.6

1.o

.1

.01

.001

3.7

1.6

.65

.25

.087

.029

.0023

4.3 x lod

2.3 x lo-%

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