Experiments upon Heat. 
3°3 
A ‘ Table of the conducing Powers of the under-mentioned 
Mediums , as determined by the foregoing experiments. 
The r mom. 
N° i. 
Thermometer N° 4. 
Taken out of freezing •water , and plunged into boiling water. 
Time elapfed. 
TorricellianVa- 
cuum (Exp. N c 
3. 4. and 13.) 
Common air, 
denfity — 1 , 
(Exp. N° 20.) 
^ I'.* 
<u 
£ a & 
& ^ w 
Rarefied air, 
denfity = ^ 
(Exp. N° 22.) 
u 00 
”03 M 
0 
£ 2 
0 ■ 
S & 
w 
CO 
Oh 
W 
w 
Mercury 
(Exp. N° 24, 
25, and 26.) 
Heat acquired. 
n° 
M. S. 
M. S. 
M. S. 
M. S. 
M. S. 
M. S. 
M. S. 
u 
0 
O 52 
O 31 
O 31 
0 29 
0 6 
0 19 
0 5 
IO 
0 58 
O 40 
0 38 
0 36 
0 4 
0 8 
0 3 f 
20 
1 3 
O 41 
0 44 
0 49 
0 s 
0 9 
O 2f 
3 ° 
1 18 
O 47 
0 51 
I I 
0 9 
0 11 
0 4 f 
40 
1 25 
1 4 
1 7 
I I 
0 18 
0 IS 
0 5 
50 
1 58 
1 23 
1 19 
I 24 
0 26 
0 21 
0 6f 
60 
3 *9 
2 28 
2 27 
2 31 
0 43 
0 34 
O I2f 
70 
1 11 57 
10 17 
10 21 
1 
j 7 45 
1 2 13 
O 58 
80 
10 S 3 
7 3 6 
7 37 
7 5 i 
1 5 1 
1 57 
0 3 6f : 
~ to- 
In determining the relative conducing powers of thefe me- 
diums, I have compared the times of the heating of the ther- 
mometers from o° to 70° inftead of taking the whole times 
from o° to 8o°, on account of the fmall variation in the heat 
of the boiling water arifing from the variation of the weight 
of the atmofphere, and alfo on account of the very flow mo- 
tion of the mercury between the 70th and the 80th degrees, 
and the difficulty of determining the precife moment when 
the mercury arrives at the Both degree. 
Taking 
