THE ATMOSPHERE.
The composition of the atmosphere is by volume, oxygen 20·8, nitrogen 79·2; by weight, oxygen 23, nitrogen 77. There are also minute quantities of carbon dioxide, aqueous vapour, and ammonia.
The barometer falls about ½” for each 500’ increase of altitude the mean temperature being 50° Fahr.
Weight or Pressure.
| = 14·706 lbs. per square inch. |
| = 29·92 inches of mercury. |
| = 33·7 feet of water. |
Squares, Cubes, Square Roots, and Cube Roots.
| No. | Square. | Cube. | Square Root √ | Cube Root ∛ |
|---|---|---|---|---|
| 1 | 1 | 1 | 1·0 | 1·0 |
| 2 | 4 | 8 | 1·414 | 1·259 |
| 3 | 9 | 27 | 1·732 | 1·442 |
| 4 | 16 | 64 | 2·0 | 1·587 |
| 5 | 25 | 125 | 2·236 | 1·709 |
| 6 | 36 | 216 | 2·449 | 1·817 |
| 7 | 49 | 343 | 2·645 | 1·912 |
| 8 | 64 | 512 | 2·828 | 2·0 |
| 9 | 81 | 729 | 3·0 | 2·080 |
| 10 | 100 | 1000 | 3·162 | 2·154 |
| 11 | 121 | 1331 | 3·316 | 2·223 |
| 12 | 144 | 1728 | 3·464 | 2·289 |
| 13 | 169 | 2197 | 3·60 | 2·35 |
| 14 | 196 | 2744 | 3·74 | 2·41 |
| 15 | 225 | 3375 | 3·87 | 2·46 |
| 16 | 256 | 4096 | 4·0 | 2·51 |
| 17 | 289 | 4913 | 4·12 | 2·58 |
| 18 | 324 | 5832 | 4·24 | 2·62 |
| 19 | 361 | 6859 | 4·35 | 2·66 |
| 20 | 400 | 8000 | 4·47 | 2·71 |
| 25 | 625 | 15625 | 5·0 | 2·92 |
| 30 | 900 | 27000 | 5·47 | 3·10 |
| 35 | 1225 | 42875 | 5·91 | 3·27 |
| 40 | 1600 | 64000 | 6·32 | 3·41 |
| 45 | 2025 | 91125 | 6·70 | 3·55 |
| 50 | 2500 | 125000 | 7·07 | 3·68 |
| 55 | 3025 | 166375 | 7·41 | 3·80 |
| 60 | 3600 | 216000 | 7·24 | 3·91 |
| 65 | 4225 | 274625 | 8·06 | 4·02 |
| 70 | 4900 | 343000 | 8·36 | 4·12 |
| 75 | 5625 | 421875 | 8·66 | 4·41 |
| 80 | 6400 | 512000 | 8·94 | 4·30 |
| 85 | 7225 | 614125 | 9·21 | 4·39 |
| 90 | 8100 | 729000 | 9·48 | 4·48 |
| 95 | 9025 | 857375 | 9·74 | 4·56 |
| 100 | 10000 | 1000000 | 10·0 | 4·64 |
| 110 | 12100 | 1331000 | 10·48 | 4·79 |
| 120 | 14400 | 1728000 | 10·95 | 4·93 |
| 130 | 16900 | 2197000 | 11·40 | 5·06 |
| 140 | 19600 | 2744000 | 11·83 | 5·19 |
| 150 | 22500 | 3375000 | 12·24 | 5·31 |
| 160 | 25600 | 4096000 | 12·64 | 5·42 |
| 170 | 28900 | 4913000 | 13·03 | 5·53 |
| 180 | 32400 | 5832000 | 13·41 | 5·64 |
| 190 | 36100 | 6859000 | 13·78 | 5·74 |
| 200 | 40000 | 8000000 | 14·14 | 5·84 |
| 210 | 44100 | 9261000 | 14·49 | 5·94 |
| 220 | 48400 | 10648000 | 14·83 | 6·03 |
| 230 | 52900 | 12167000 | 15·16 | 6·12 |
| 240 | 57600 | 13824000 | 15·49 | 6·21 |
| 250 | 62500 | 15625000 | 15·81 | 6·29 |
| 260 | 67600 | 17576000 | 16·12 | 6·38 |
| 270 | 72900 | 19683000 | 16·43 | 6·46 |
| 280 | 78400 | 21952000 | 16·73 | 6·54 |
| 290 | 84100 | 24389000 | 17·02 | 6·61 |
| 300 | 90000 | 27000000 | 17·32 | 6·69 |
| 310 | 96100 | 29791000 | 17·60 | 6·76 |
| 320 | 102400 | 32768000 | 17·88 | 6·83 |
| 330 | 108900 | 35937000 | 18·16 | 6·91 |
| 340 | 115600 | 39304000 | 18·43 | 6·97 |
| 350 | 122500 | 42875000 | 18·17 | 7·04 |
| 360 | 129600 | 46656000 | 18·97 | 7·11 |
| 370 | 136900 | 50653000 | 19·23 | 7·17 |
| 380 | 144400 | 54872000 | 19·49 | 7·24 |
| 390 | 152100 | 59319000 | 19·74 | 7·30 |
| 400 | 160000 | 64000000 | 20·0 | 7·36 |
| 410 | 168100 | 68921000 | 20·24 | 7·42 |
| 420 | 176400 | 74088000 | 20·49 | 7·48 |
| 430 | 184900 | 79507000 | 20·73 | 7·54 |
| 440 | 193600 | 85184000 | 20·97 | 7·60 |
| 450 | 202500 | 91125000 | 21·21 | 7·66 |
| 460 | 211600 | 97336000 | 21·44 | 7·71 |
| 470 | 220900 | 103823000 | 21·67 | 7·77 |
| 480 | 230400 | 110592000 | 21·90 | 7·82 |
| 490 | 240100 | 117649000 | 22·13 | 7·88 |
| 500 | 250000 | 125000000 | 22·36 | 7·93 |
| 510 | 260100 | 132651000 | 22·58 | 7·98 |
| 520 | 270400 | 140608000 | 22·80 | 8·04 |
| 530 | 280900 | 148877000 | 23·02 | 8·09 |
| 540 | 291600 | 157464000 | 23·23 | 8·14 |
| 550 | 302500 | 166375000 | 23·45 | 8·19 |
| 560 | 313600 | 175616000 | 23·66 | 8·24 |
| 570 | 324900 | 185193000 | 23·87 | 8·29 |
| 580 | 336400 | 195192000 | 24·08 | 8·33 |
| 590 | 348100 | 205379000 | 24·29 | 8·38 |
| 600 | 360000 | 216000000 | 24·49 | 8·43 |
| 610 | 372100 | 226981000 | 24·69 | 8·48 |
| 620 | 384400 | 238328000 | 24·90 | 8·52 |