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In brief: Water. Free fluid is typically water. The lining of your abdominal contents are slippery (your bowel, the lining of your organs) and it's thus wet inside your abdomen. It's normal to have a little free fluid in one's pelvis, as that's where fluid tends to pool.
fluid in the body, other than in the alimentary or urinary tracts, which is not part of tissue fluid but free in a body cavity or as a discrete mass in an organ. free gas bloat. see ruminal tympany. free hormone hypothesis.