When the solid has a high affinity for water - in which case it is called hydrophilic (high energy e.g. glass)- water spreads. In the opposite case of hydrophobic (low energy e.g. teflon) surfaces, water does not spread but, instead, forms at equilibrium a spherical cap resting on the substrate with a 'contact angle'.
Infections such as trichomoniasis, gonorrhea, and Chlamydia (all STDs); and yeast infection can all cause vaginal discharge. Vaginal discharge can be associated with other symptoms such as burning or itching. Antibiotics are given for infections that cause vaginal discharge.
1 May also be accompanied by itching and swelling. 2  Yellow or green discharge â A yellow or green discharge, especially when it is thick, chunky, or accompanied by a bad smell, is not normal. 3  This type of discharge may be a sign of the infection trichomoniasis, which is commonly spread through sexual intercourse.