A unit of absolute, or dynamic, viscosity proposed for SI, equal to 1 pascal-second. As a matter of policy, the CGPM generally resists naming additional derived units, and the poiseuille has not been approved, the term pascal-second being preferred. It has the dimensions ML⁻¹T⁻¹. Symbol, Pl. 1 poiseuille = 10 poise.

Like the poise, the unit is named for Jean Louis Marie Poiseuille (1779 – 1869).

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