Pascalsekuntia

The pascalsekuntia is a non-SI unit of dynamic viscosity, defined as one pascal-second. It is equivalent to the dynamic viscosity of a Newtonian fluid in which a stress of one newton per square meter results in an onset velocity of one meter per second within a radial distance of one meter from the surface. The pascal-second is derived from the SI units of pressure (pascals) and time (seconds). It is often used in scientific and engineering contexts, particularly in fluid dynamics. The unit is named after the French mathematician and physicist Blaise Pascal. While the pascal-second is a valid unit, the SI unit for dynamic viscosity is the pascal-second (Pa·s). Another common unit of dynamic viscosity is the poise (P), where 1 Pa·s = 10 P. The centipoise (cP) is also frequently used, with 1 cP = 0.001 Pa·s. For example, the dynamic viscosity of water at room temperature is approximately 1 centipoise, or 0.001 pascal-seconds. The pascal-second provides a direct link between the concepts of stress and strain rate in viscous flow, making it a convenient unit for calculations and theoretical analysis.