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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.
This colloquial usage of the term is also common in medicine and in nutrition (take plenty of fluids). Liquids form a free surface (that is, a surface not created by the container) while gases do not. The distinction between solids and fluid is not entirely obvious.The distinction is made by evaluating the viscosity of the substance.his colloquial usage of the term is also common in medicine and in nutrition (take plenty of fluids). Liquids form a free surface (that is, a surface not created by the container) while gases do not. The distinction between solids and fluid is not entirely obvious.