👉 The Relative Fluid fraction (RFF) is a critical concept in fluid dynamics and blood flow studies, particularly in understanding blood flow through vessels. It quantifies the proportion of a fluid component (typically plasma) that is not bound to red blood cells, often referred to as the "free" or "plasma" fraction. RFF is calculated by dividing the volume of plasma by the total volume of fluid in a vessel, providing insight into the extent to which blood is free to move through the vasculature. This fraction is essential for assessing blood viscosity, flow resistance, and overall cardiovascular health, as it helps differentiate between the contributions of plasma and cellular components to total blood viscosity.
