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[Hossein <question699997@xxxxxxxxxxxxxxxxxxxxx>]

Question #699997 on Yade changed:
https://answers.launchpad.net/yade/+question/699997

Description changed to:
Hi every body

I have to get the SWRC curve base on the experimental test (Pressure Plate ). It is vital to define surface tension which is physically 
equal to 0.0728 (N/m) for water, however I have seen in one of the examples (drainage-2PFV-Yuan_and_Chareyre_2017) that surface 
tension is equal to 10 (line 127). I've changed the number of surface tension, for example it was multiplied  to 4 (0.0728*4) and then result became better since, the type of soil is fine-grained.Therefore I came up with these questions :

1) Why in above-mentioned example surface tension is equal to 10? Is it
unit-less?

2) why when surface tension increased (0.0728*4 )sample drained slower?
It means water content decreased slowly while, when surface tension is
equal to 0.0728 water content drop sharply!

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