| |
Atmo- +-----------+-----------+ Volume |Temperature | Total
spheres.|Pounds per |Pounds per | in Cubic | of the Air | Increase of
|Square Inch|Square Inch| Feet. | throughout | Temperature.
| above a |above the | |the Process.| Degrees.
| Vacuum. |Atmosphere | | Degrees. |
| |(Gauge | | |
| |Pressure). | | |
--------+-----------+-----------+----------+------------+-------------
1.00 | 14.70 | 0.00 | 1.0000 | 60.0 | 00.0
1.10 | 16.17 | 1.47 | 0.9346 | 74.6 | 14.6
1.25 | 18.37 | 3.67 | 0.8536 | 94.8 | 34.8
1.50 | 22.05 | 7.35 | 0.7501 | 124.9 | 64.9
1.75 | 25.81 | 11.11 | 0.6724 | 151.6 | 91.6
2.00 | 29.40 | 14.70 | 0.6117 | 175.8 | 115.8
2.50 | 36.70 | 22.00 | 0.5221 | 218.3 | 158.3
3.00 | 44.10 | 29.40 | 0.4588 | 255.1 | 195.1
3.50 | 51.40 | 36.70 | 0.4113 | 287.8 | 227.8
4.00 | 58.80 | 44.10 | 0.3741 | 317.4 | 257.4
5.00 | 73.50 | 58.80 | 0.3194 | 369.4 | 309.4
6.00 | 88.20 | 73.50 | 0.2806 | 414.5 | 354.5
7.00 | 102.90 | 88.20 | 0.2516 | 454.5 | 394.5
8.00 | 117.60 | 102.90 | 0.2288 | 490.6 | 430.6
9.00 | 132.30 | 117.60 | 0.2105 | 523.7 | 463.4
10.00 | 147.00 | 132.30 | 0.1953 | 554.0 | 494.0
15.00 | 220.50 | 205.80 | 0.1465 | 681.0 | 621.0
20.00 | 294.00 | 279.30 | 0.1195 | 781.0 | 721.0
25.00 | 367.50 | 352.80 | 0.1020 | 864.0 | 804.0
--------+-----------+-----------+----------+------------+-------------

A cubic foot of free air at a pressure of one atmosphere (equal to 14.7
pounds above a vacuum) at a temperature of 60 degrees, when compressed
to twenty-five atmospheres, will register 367.5 pounds above a vacuum
(352.8 pounds gauge pressure), will occupy a volume of 0.1020 cubic
foot, will have a temperature of 864 degrees, and the total increase of
temperature is 804 degrees.

The thermal results of air compression and expansion are shown by the
accompanying diagram.

The horizontal and vertical lines are the measures of vol