Special Cases

1. Apolar liquids

Examples of apolar liquids are low molecular weight oils like hexane, decane, and octane.

2. Polar liquids (e.g. water) on apolar surface (e.g. Teflon)

Teflon is a low surface tension material and so is polyethylene (though it sometimes has a small residual polarity).

If the contact angle would increase. This would mean that the surface is a hydrophobic surface.