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.
It is a sexually transmitted disease (STD). Signs of trichomoniasis may include a yellow-gray or green vaginal discharge. The discharge may have a fishy odor, which may lead one to confuse it with bacterial vaginosis. Burning, irritation, redness and swelling of the genitals may occur. Pain may occur during urination.