﻿220 Dr. F. H. Newman on Absorption of Hydrogen 



Element. 



Initial Gas 



Pressure. 



mm. H?. X 10-3 



Final Gas 



Pressure. 



mm.Hg.XlO-3. 



Volume of Gas 



absorbed. 



c.c. x 10-3. 



Pressure of 



Gas at which 



action ceased. 



mm.Hg.XlO -3 . 



Sodium 



Potassium 



Sodium-Potassium 

 Alloy. 



T743 

 1336 



726 

 349 



738 

 392 



336 

 123 



349 

 163 



392 



188 



329 

 145 



58 



f740 

 Sulphur i 329 



f748 



Phosphorus -{352 



1200 



t j- ' 763 



Iodme 1338 



Arsenic {394 



Cadmium j ^o 



Calcium |^ 04 



»»■': {23 



ry J 753 



Zmc J431 



Thallium {560 



j , j\ Hydrogen was liberated and not absorbed 



352 



147 



44 



338 

 150 



394 



206 



463 

 321 



404 



386 

 264 



431 



306 



560 

 399 



28 

 14 



26 

 13 



23 

 15 



28 



13 



6 



27 

 14 



7 



28 

 13 



24 

 13 



19 



10 



23 



7 



25 



8 



22 



8 



12 

 11 



96 



84 



110 

 26 



14 



124 



108 

 284 

 152 

 131 

 276 

 297 



absorption ceased. There appears to be a fatigue effect 

 whereby the actual amount of gas which can be absorbed by 

 any surface is limited. This fatigue effect may be due to 

 three causes. If the disappearance of the gas depends on 

 chemical action, the latter will occur mainly at the surface 

 of the element. The formation of a chemical compound will 

 thus protect the rest of the substance from the action, and 

 the process will gradually cease. If, on the other hand, 

 the effect is due to a deposition of the gaseous atoms on 



