PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
193 
Fluorine appears, lastly, to have a considerably smaller atomic heat than 6*4. The 
atomic heat of fluoride of calcium, Ga Fl 2 , has been found to be (§ 84) only 16 '4, con- 
siderably smaller than the corresponding chlorides, bromides, and iodides. I put the 
atomic heat of fluorine at 16 ' 4 ~ 6 ' 4 =5. 
103. Taking, in accordance with what has just been said, the atomic heat which an 
element has in a solid compound, 
At 6*4 for Ag, Al, As, Au, Ba, Bi, Br, Ga, Gd, Cl, Go, Gr, Gu, Be, Hg, I, Fr, K, Li, 
Mg, Mn, Mo, N, Na, M, Os, Bb, Pd, Ft, Bb, Bh, Sb, Be, Bn, Sr, Te, Ti, Tl, W, 
Zn, and Zr, 
At 5-4 for S and P, at 5 for FI, 4 for O, 3-8 for Si, 2*7 for B, 2-3 for H, and 1*8 for G ; 
and assuming that the atomic heat of a solid is given by the sum of the atomic 
heats of the elements in it, we obtain the atomic heats ; and dividing them by the atomic 
weights, we obtain the specific heats, in sufficiently close agreement with the specific 
heats as obtained by direct determinations of this property. 
In the following Table I give for all compounds for which the specific heat has been 
determined in a trustworthy manner, the specific heat calculated on these assumptions, 
compared with the numbers found experimentally. I give this calculation and this com- 
parison in the same order which was followed in the synopsis § 82 to 89, and I refer 
to the latter as regards special remarks on the determinations. To distinguish the 
observers, N. again stands for Neumann, B. Begnault, Kp. Kopp, Pr. Person, A. Al- 
luard, and Pp. Pape. 
Alloys. (Compare § 82.) 
At * 
Atomic 
Atomic 
Specific 
Specific 
heat. 
heat. 
heat. 
° Calculated. Calculated. 
Observed. 
Bi Bn . . . 
. . 328 
12-8 
0-0390 
0-0400 
B. 
BiSn 2 . . . 
. . 446 
19-2 
0-0430 
0-0450 
B. 
Bi Sn 2 Sb . . 
. . 568 
25-6 
0-0451 
0-0462 
K. 
Bi Sn 2 , Sb Zn 2 
. . 698-4 
38-4 
0-0550 
0-0566 
B. 
PbSb . . . 
. . 329 
12-8 
0-0389 
0-0388 
B. 
PbSn . . . 
. . 325 
12-8 
0-0394 
0-0407 
B. 
PbSn 2 . . . 
. . 443 
19-2 
0-0433 
0-0451 
B. 
104. Arsenides and Sulphides. (Compar 
CO 
qo 
•O’ 
GoAs 2 . . . 
. . 208-8 
19-2 
0-0919 
0-0920 
N. 
Ag 2 B . . . 
. . 248 
18-2 
0-0734 
0-0746 
B. 
GoAsS . . 
. . 166 
18-2 
0-110 
0-107 
N. 
Gu 2 B . . . 
. . 158-8 
18-2 
0-115 
0-121 
B. 
0-120 
Kp. 
Fe As B . . 
. . 163 
18-2 
0-112 
0-101 
N. 
AsB . . . 
. . 107 
11-8 
0-110 
0-111 
N. 
GoB . . . 
. . 90-8 
11-8 
0-130 
0-125 
B. 
Gui. Per. B . . 
. . 91-7 
11-8 
0-129 
0-129 
N. 
0-131 
Kp. 
Fe B . . . 
. . 88 
11-8 
0-134 
0-136 
B. 
HgS . . . 
. . 232 
11-8 
0-0509 
0-052 
N. 
0-0512 
B. 
NiS . . . 
. . 90-8 
11-8 
0-130 
0-128 
B. 
2 d 2 
