122 
DRS. W. RAMSAY AND S. YOUNG ON SOME OF 
Volumes of 1 grin, of Steam, at Various Temperatures and Pressures. 
I. High Temperatures. 
Two series of experiments were made. The weight of the water in the tube was 
ascertained by determining the products of pressure and volume, altering the volumes ; 
and this was repeated at different temperatures. Assuming that if these products for 
any one temperature were constant, the density of the steam was constant, viz., the 
theoretical density, 9, the weight could be ascertained by the equation 
_ V.D. x p.v x 273 
W “ 11-1636 x 1000 x 760 x (273 + t)' 
This expression simplifies to 
log W = log p.v. + 4’46179 — log (273 + t). 
During the progress of the experiments it happened that a trace of water passed 
up the tube, adding itself to that already present. This, of course, increased the 
weight, hence new measurements were made to determine the amount of the increase. 
These weights were obtained from the following readings :—- 
Determination of the Weight of the Smallest Quantity of Water. (A.) 
Temperature. 
Volume. 
Pressure. 
p.v. 
W eight. 
Mean -weight. 
' 
O 
cub. centims. 
millims. 
grm. 
grm. 
220 
1-7147 
2528 
4335 
0-002546 
1-5565 
2770 
4311 
0-002533 
1-4080 
3060 
4308 
0-002531 
1-2592 
3435 
4325 
0-002541 
• 
1-1072 
3893 
4310 
0-002532 
0-002536 
o 
CO 
CM 
1-7151 
2585 
4434 
0-002553 
1-5569 
2820 
4391 
0-002529 
1-4084 
3119 
4393 
0-002529 
1-1579 
3815 
4417 
0-002543 
0-002538 
General mean, 0"002537. 
Here some water rose in the tube and increased the weight. 
' 
230 
1-7151 
2633 
4516 
0-002600 
1"5569 
2879 
4482 
0-002581 
1-4084 
3153 
4441 
0-002587 
0-002579 
240 
1-7156 
2697 
4627 
0-002612 
1-5573 
2948 
4591 
0-002598 
1-4087 
3253 
4583 
0-002587 
1-1582 
3964 
4591 
0 002592 
0-002597 
250 
1-5064 
3097 
4665 
0-002582 
1-4091 
3310 
4664 
0-002581 
1-1585 
4026 
4664 
0-002581 
0-002581 
! 
1 
General mean, 0 002587. 
