. Absorption of vapors and gases by soils . t. Absorption capacity. The absorption capacity of the solid affects the rate of absorptionto a marked degree. Where the absorption capacity is high, thespeed of absorption is very great. a See !•:. Wollny, Forsch. 10, 193 (1893); Buckingham, Bui. No. 25,Bureau of Soils, U. S. Dept. Agr. (1904). RATE OF ABSORPTION. 41 Partial pressure, or humidity. The rate of absorption of water by soils varies for atmospheresof different humidity in a manner similar to the change in rate ofevaporation under different degrees of humidity, as can be seenfr
. Absorption of vapors and gases by soils . t. Absorption capacity. The absorption capacity of the solid affects the rate of absorptionto a marked degree. Where the absorption capacity is high, thespeed of absorption is very great. a See !•:. Wollny, Forsch. 10, 193 (1893); Buckingham, Bui. No. 25,Bureau of Soils, U. S. Dept. Agr. (1904). RATE OF ABSORPTION. 41 Partial pressure, or humidity. The rate of absorption of water by soils varies for atmospheresof different humidity in a manner similar to the change in rate ofevaporation under different degrees of humidity, as can be seenfrom the curves in figure 15 for Sea Island cotton soil plotted fromthe data given in the lower half of Table IV. Qrdinates are in per-centage of moisture in the soil, abscissas are in time in days. Allthe experiments begin at per cent of moisture, the quantity re-tained by Sea Island cotton soil in air-dry condition. Van Bemmelen,0 Hellriegel,6 and von Dobeneckd havedetermined the speed with which a soil absorbs water 8 10 TIMC IN DAYS. 20 Fig. —Curves showing rate of absorption of water vapor by Sea Island cotton soil under different degrees of humidity. They, too, give very regular rate curves, but these, as well asParks e rate of absorption of water vapor by glass wool, are like-wise not described by a simple mathematical formula. Ilant/sch •has shown that the rate of absorption of ammonia gas by solidorganic acids in finely powdered condition depends upon the partialpressure of the ammonia gas in the atmosphere above the solid absolute ammonia, the reaction is fairly well described by the first order reaction velocity equation, K = y ---- ), and on dilution of the ammonia with air, this equation still holds if thetotal volume of gas employed is so great that the partial .pressureof the ammonia is practically constant throughout the absorptionprocess. If, however, the quantity of ammonia present in the gas is con-siderably redu
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