Dear Khushdeep Goyal,

Thanks for your answer. I too believe in that.

How to convince our opinion? 

Dear Billa,

     Which method you will use may depend also on your intentions. In general, measuring the wetting properties (static contact angle, contact angle hysteresis) is enough to determine the degree of hydrophobicity of a certain material. However, water absorption is useful as well and helps understanding how your particular surface would behave in highly humid environments, for example, or how it will absorb water, which is interesting in for agricultural applications (the extent to which the soil would absorb or repel water). Speaking strictly about the terms, the hydrophobicity/hydrophilicity of any solid substrate is defined by its wetting properties. 

Sincerely,

Karekin