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.
Discharge is completely normal during pregnancy, and you may get a lot of it at times. But if youâre seeing light yellow discharge â particularly if it has an unpleasant odor and is accompanied by itching â itâs time to see your OB. This may be a sign that you have an infection or an STD.