This ceramic can be found in tensiometers. Her structure (pores) is similar to soil structure and takes and gives water as soil does. In addition is there any other material that have similar properties?

http://ceramic.che.nthu.edu.tw/document/journal/porous%20ceramics%20for%20humidity.pdf

http://www.ictinternational.com/products/cups/porous-ceramic-cups/

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