👉 Fluid degrees, often used in thermodynamics and heat transfer, represent the ratio of the specific heat capacities at constant pressure (Cp) and constant volume (Cv) for a substance. Mathematically, they are expressed as Fluid Degree of Freedom (FDF), which is given by the formula FDF = Cp - Cv. This value indicates how much a substance can change its temperature while maintaining constant volume or pressure, respectively. A higher FDF suggests that the substance has more degrees of freedom and can thus absorb or release more heat without a significant change in temperature. In practical terms, fluids with higher degrees of freedom, such as gases, can expand more readily to accommodate temperature changes compared to solids or liquids with lower degrees of freedom.
