ABSTRACT
For some iner t gases the d i f fus ion coe f f i c ien t i s independent of H so
that D = const.
The p e n e t r a t i o n o f g a s e s i s described by eq. (6) :
where
'1 K 2
3 V = volume of gas [m ] f lowing during time t [sec]
2 P t ~ P o = pressure gradient [N/m ] average pressure in cap i l l a r y pores = (p 1 +p 2 ) /2
2 p = pressure at which V i s observed [N/m ]
A = penetrated area [m ]
1 = thickness of member [m] 2
n = v i scos i t y of the gas [Nsec/m ] 2
K = coe f f i c ien t of gas permeabil i ty [m ]
If in eq. (6) the v i scos i t y n and the average pressure p are not t a - 2
ken into account a coe f f i c ien t of gas permeabil i ty K $ in [m /sec] has to be used.
