M. R. Bunsen on the Law of Absorption of Gases. 191 



subject to the partial pressure -^ — . It is however absorbed 



under this pressure by the volume h y of water. The absorbed 

 volume of hydrogen, reduced to 0*76 pressure and 0° C, is 



therefore, according to the law of absorption, ~ a v k v This 



M 



absorbed hydrogen + unabsorbed x x is equal to the hydrogen 

 originally present, namely, — 



PV (, *.h,\ PV 



rrt+ty 



or #, = - 



8X0-76—V-V,;-* '- 2x0 . 76 ( 1+ ^)- 



0'76x 

 If the value of x, is substituted in the expression — ^ — -, we 



v i 

 obtain for the pressure of the hydrogen in the residual gas 



PV 



ttt^ r-r, and for the pressure of the methyle by similar con- 



<*( v i + "i«i) pv 



Sideratl0DS g(V 1 + ftA,) - 



It follows, however, from the law of absorption, that the sum 

 of the two pressures is equal to the observed pressure Pj. We 

 have then, — py py 



Pl = 2(V 1 +-« 1 A,) + 2(V 1 +/8 1 A 1 )' 

 or, .- PV 2V, 



^ + ^=wa-i^ (19) 



An experiment made by Dr. Pauli with a gas prepared by 

 heating acetate of potash with hydrate of potash, carefully freed 

 from clayle and carbonic acid with fuming sulphuric acid and 

 potash, gave the following elements for calculation : — 

 Original volume of gas reduced to 0° ... V = 116 - 42 



The pressure on this volume P = 0-5065 



Volume of gas employed reduced to 0° after 



first absorption Vj = 75*18 



Corresponding pressure Pi — - G615 



Volume of absorbing water /*, = 318-11 



Temperature of the experiment 12°*8 C. 



Absorption-coefficient of hydrogen at 12 0, 8 . ct l = 001930 

 Absorption-coefficient of methyle gas at 12 0, 8 . /3, = 0-05146 

 Absorption-coefficient of marsh gas at 12 0- 8 . 7! = 0-04106 

 The volume after second absorption reduced to0° V„ = 79'04 



Corresponding pressure P»= 0-6561 



Volume of absorbing water //„ =325-05 



Temperature of experiment . . . . . . t n = 24°*6 



Absorption-coefficient of hydrogen at 24° - 6 . a„= 0-01930 

 Absorption- coefficient of methyle at 24 0, 6 . . /3„== 0-04181 

 Absorption-coefficient of marsh gas at 24 0, 6 . y„= 0-03166 



