Interstitial fluid (or tissue fluid) is a solution that bathes and surrounds the cells of multicellular animals. It is the main component of the extracellular fluid, which also includes plasma and transcellular fluid. The interstitial fluid is found in the interstitial spaces, also known as the tissue spaces.
On average, a person has about 11 litres (2.4 imperial gallons or ~2.9 US gal) of interstitial fluid, providing the cells of the body with nutrients and a means of waste removal.
Read more about Interstitial Fluid: Production and Removal, Composition, Physiological Function, Structure of The Lymphatic System
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