114 



BULLETIN 1059 1 , U. S. DEPARTMENT OF AGRICULTURE. 



hold the vapor under high pressure. The effect of this is seen in 

 diagram 7, where some of the typical results are illustrated. In 

 Table 5 is shown only the absorption for four periods, eliminating 

 this period of general loss. Except this period, the exposure in the 



1* 













































DIAGRAM 7 

 MOISTURE ABSORPTION IN VAPOR 



by fine: sand and other substances 



WITl-t FINE SAND 



































y 



















/' 











-C 



o 































,' 



'"' 



















i 























/' 

















•*- 



9 ° 



























/' 



















MO 



(0 







3 

















ov' 



/ 





















0) 

 O 



7 J0 







a) 



















if 

















-"" 









Q- 







fc 











y 



/ 













,,-- 



--'' 













Q. 

 5 1_ 







'5 

 ca 











' 









,-!-*■? 



>>-'' 



■' 

















.O 



■1 < 







o 



V 







/ 









„„ 



"'' 























<1J 



L 



» P 







II 





,, 







.''' 



-'' 



























O 



z2 



, 



.^' 



+, O 







/' 



' 































^ 



?r^ 



^^ 



^ 



^5^ 



.s_ 





: = 



■= 



4? 



T To" 



. Hur 



Sa^d 



~6?.~ 



siTF2 



Clay 



rre-S 



and— 





















r 2 



J £ 



G 



8 



) l 



00 1 



20 1 



*o 



60 



Tim 



80 2 



?6 da > a 



s 



20 2 





GO 2 



80 J 



OO J 



20 3 



40 3 



tO 130 4 00 





cellar has been at temperatures between 0° and 10° C, which, it 

 will be noted, are lower than have previously been employed. 



For several of the soil types duplicates were run. The results, 

 however, are so nearly identical in each pair that only the averages 

 need be given. 



Table 5.— Absorption of water vapor by Nebraska fine sand, and modifications 



thereof. 

 [Basis 100 grams dry matter in 2i-inch aluminum can.] 



Num- 

 ber 

 of 

 sam- 

 ples. 



Description of sample. 



Absorption at end of— 



5 

 days. 



10 

 days. 



63 

 days. 



382 

 days. 



100 per cent fine sand, unwashed 



100 per cent fine sand unwashed half-size i 



100 per cent fine sand, washed 2 



90 per cent fine sand, 10 per cent very fine sand 



90 per cent fine sand, 10 per cent silt and clay 



80 per cent fine, 10 per cent very fine, 10 per cent silt and 

 clay. 



„>, per cent fine sand, 10 per cent fine limestone soil 



90 per cent fine sand, 10 per cent calcium carbonate 



99 per cent fine washed sand, 1 per cent KNO 32 



98 per cent fine washed sand, 2 per cent KN O 3 



97 per cent fine washed sand, 3 per cent KNO 3 



98 per cent fine sand, 2 per cent ground decayed wood . 

 96 per cent fine sand, 4 per cent ground decayed wood . 



Per cent. 

 0.56 

 .68 

 .57 

 .51 

 .97 



.93 

 .72 

 .71 

 .74 

 .75 

 .73 

 .87 

 1.15 



Per cent. 



0.58 

 .68 

 .62 

 .59 



1.10 



1.07 

 .85 



1.07 



1.03 



.99 



1.33 



Per cent. 



0.68 

 .72 

 .69 

 .64 



1.33 



1.37 

 .96 

 1.55 

 2.88 

 3.20 

 3.01 

 1.13 

 1.64 



Per cent. 



0.80 



1.08 



.79 



.89 



1.59 



1.72 



1.27 

 2.05 

 7.75 

 11.69 

 13.77 

 1.61 

 1.68 



1 To indicate effect of volume and depth on rate of absorption. 



4 Washed with 5 volumes of distilled water. 



1 Potassium nitrate applied in solution, and water evaporated before starting the test. 



