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| In 1957 [[John Philip]] introduced the term '''sorptivity''' and defined it as ''a measure of the capacity of the medium to absorb or desorb liquid by [[capillarity]]''.<ref name="Philip57">{{Cite journal | last=Philip | first=John R | title=The theory of infiltration: 4. Sorptivity and algebraic infiltration equations| journal=Soil Science | volume=84 | pages=257–264 | year= 1957 }}</ref>
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| According to C Hall and W D Hoff, the sorptivity ''expresses the tendency of a material to absorb and transmit water and other liquids by capillarity.''<ref name="WTBSC2">{{Cite book|last=Hall|first=Christopher|last2=Hoff|first2=William D|title=Water transport in brick, stone and concrete, 2nd edn|year=2012|publisher=Taylor and Francis|location=London and New York|url=http://www.routledge.com/books/details/9780415564670/}}</ref>
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| The sorptivity is widely used in characterizing soils and porous construction materials such as brick, stone and concrete.
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| Calculation of the true sorptivity required numerical iterative procedures dependent on soil water content and diffusivity.
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| [[John Philip]] (1969) showed that sorptivity can be determined from horizontal infiltration where water flow is mostly controlled by capillary absorption:
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| <math> I = S \sqrt{t}\ </math>
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| where ''S'' is sorptivity, ''I'' is the cumulative infiltration at time, ''t''.
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| For vertical infiltration, Philip's solution is adapted using a parameter A<sub>1</sub>. This results in the following equations, which are valid for short times:
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| cumulative: <math> I = S \sqrt{t}\ + A_1 t</math>, rate <math> i = 0.5 S/ \sqrt{t}\ + A_1</math> where the sorptivity S is defined (when a sharp wetting front L<sub>f</sub> exists, as: <math> S(\theta_0 , \theta_i) = \frac{(\theta_0 - \theta_i) L_f}{t^{1/2}} </math>
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| ==References==
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| {{Reflist}}
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| [[Category:Soil physics]]
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Revision as of 20:41, 16 February 2014
The author is recognized by the name of Numbers Lint. His family members life in South Dakota but his spouse desires them to move. What I love performing is playing baseball but I haven't produced a dime with it. Managing people is his occupation.
Also visit my website - home std test (over at this website)