If this is a sound wave, the denser the medium, the faster the wave. For a light wave, the denser the medium, the slower the wave. It all depends on the medium through which it travels. The factor of the medium that plays a role on the velocity of a wave is its density. If this is a sound wave, the denser the medium, the faster the wave.
Mastitis is an infection of the tissue of the breast that occurs most frequently during the time of breastfeeding. This infection causes pain, swelling, redness, and increased temperature of the breast. It can occur when bacteria, often from the infant's mouth, enter a milk duct through a crack in the nipple. This causes an infection and painful inflammation of the breast.
What is mastitis? Mastitis is an infection and inflammation of the breast, usually the fatty tissue of the breast, that causes redness, pain and swelling. As this swelling pushes on the milk ducts, it causes pain. Mastitis is usually caused by an infection with the bacteria Staphylococcus aureus. These bacteria are normally present on your skin, but cause problems when they enter the body. Bacteria causing mastitis enter through a break or crack in the skin of the breast, usually on the nipple.