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.
What is green vaginal discharge? Some amount of vaginal discharge is normal among women; it is often clear or whitish with a minimal odor. If the discharge changes in color, odor or texture, it may be a sign of an infection, although some variation throughout the menstrual cycle is common. Infections may be accompanied by other symptoms, such as itching, burning, discomfort or spotting. The most common cause of green vaginal discharge is a sexually transmitted infection known as trichomoniasis. The discharge often has a foul odor and is typically more yellowish-green than pure green. Intercourse and urination may cause discomfort, and the genital area may be itchy.