![]() ![]() Kinematic viscosity is defined as the quotient of a fluid’s absolute viscosity in centipoises over its specific gravity, both measured at the same temperature. The unit of kinematic viscosity is the stoke or the centistoke (1/100 of a stoke). This is the time required by an oil to flow through a capillary tube under the force of gravity. Empirical viscosity, like Saybolt viscosity, is expressed in arbitrary units of time, usually seconds. Absolute viscosity and kinematic viscosity are expressed in fundamental units. This is sometimes also called dynamic viscosity. The absolute viscosity divided by the fluid’s density gives the kinematic viscosity. It is a fluid’s internal flow resistance. This represents the ratio of a fluid’s shear stress to its velocity gradient. The same meaning as the word viscosity used alone, to distinguish from empirical viscosity or kinematic viscosity. In the metric system, absolute viscosity is expressed in poise. ![]() The specific units used may vary depending on the system of measurement (e.g., SI units, US customary units) and the context of the problem being analyzed.Defines a fluid’s flow resistance. These properties are fundamental in fluid mechanics and play a crucial role in understanding and analyzing the behavior of fluids in various engineering and scientific applications. ☌)) or other appropriate units.ĭefinition: Dimensionless number representing the speed of a fluid relative to the speed of sound in that fluid.☌)) or specific heat units (varies).ĭefinition: Ability of a fluid to conduct heat.Units: Watts per meter per degree Celsius (W/(m.s), Poise (P), centipoise (cP).ĭefinition: The ratio of fluid viscosity to its density.Units: Square meters per second (m²/s) or stokes (St).ĭefinition: Speed of fluid particles in a given direction.Units: Meters per second (m/s), feet per second (ft/s), etc.ĭefinition: Volume of fluid passing through a cross-sectional area per unit time.Units: Cubic meters per second (m³/s), liters per second (L/s), etc.ĭefinition: Measure of how much a fluid's density changes with pressure.Units: Per pascal (Pa⁻¹) or per bar (bar⁻¹).ĭefinition: Force per unit length at the surface of a liquid.Units: Newtons per meter (N/m) or dynes per centimeter (dyn/cm).ĭefinition: Measure of a fluid's resistance to volume change under pressure.Units: Pascals (Pa) or pounds per square inch (psi).ĭefinition: The rate of change of density with respect to position in the fluid.Units: Kilograms per cubic meter per meter (kg/m⁴) or other appropriate units.ĭefinition: The amount of heat energy required to change the temperature of a unit mass of fluid by 1 degree.Units: Joules per kilogram per degree Celsius (J/(kg.Here are some of the key properties of fluids and their respective units:ĭefinition: Mass per unit volume of a fluid.Units: Kilograms per cubic meter (kg/m³) or grams per cubic centimeter (g/cm³).ĭefinition: Weight per unit volume of a fluid.Units: Newtons per cubic meter (N/m³) or pounds-force per cubic foot (lb/ft³).ĭefinition: Force per unit area exerted by a fluid.Units: Pascals (Pa), N/m², bar, psi (pounds per square inch), etc.ĭefinition: Measure of the kinetic energy of fluid particles.Units: Degrees Celsius (☌), Kelvin (K), Fahrenheit (☏).ĭefinition: Measure of a fluid's resistance to flow.Units: Pascals per second (Pa ![]() The units of dynamic viscosity are Poise or Pa. They are related via the density of the medium, with. First, we differentiate between the kinematic and dynamic viscosities, referred to by symbols and or. Fluids, which include liquids and gases, possess several properties that are important in the study of fluid mechanics and their various applications. There are several different types of viscosities that one may encounter in fluid dynamics.
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