What is solid vapor, liquid vapor, solid liquid interfaces$/$interracial tensions

Use and need $,$ definition in hydrophobic surfaces

what are defn $/$ and use of Young eqn, contact angle measurement $,$ Wenzel model, cassie$-$ Baxter model $,$ roughness factor $,$ sliding angle in superhydrophobicity $/$ phillicity of materials$($ biomaterials$)$

How does air pockets trapped within surface structure help repel water? In superhydrophobic surfaces?

Ideal superhydrophobic, superphillic surface texture, shape$/$design $,$ surface chemistry