PHYSICAL INTER-RELATIONS IN SOILS 37 



FIG. 14. Chart showing the effect of a given amount of heat in raising 

 the temperature of soils with different water content. Curve A 

 shows the temperature effect produced by the amount of heat that 

 would raise the temperature of 100 Ib. of dry soil 10. Observe 

 that this amount of heat would raise the same soil with 20 % of 

 water but 5, and with 50% of water, less than 3. Curve B shows 

 the temperature effect of the amount of heat that would raise 100 

 Ib. of soil with 20% of water 10. Observe that if the same soil 

 contained but 15% of water, its temperature would be raised nearly 

 lli, but if it contained 40 % of water, it would be raised only 6.6. 



