Born 22 Apr 1797; died 26 Dec 1869 at age 72.

#French #physician and #physiologist who contributed to knowledge of #bloodcirculation through #arteries and experimentally derived an equation describing the #laminarflow rate of #fluids through narrow #tubes (now known as the #Hagen- Poiseuille equation because the #German #engineer Gotthilf Hagen also independently discovered it).

It relates the #flowrate to the fluid's #viscosity, the #pressure drop along the tube, and the #radius of the tube. His interest in the circulation of the blood led him to conduct experiments on the flow of liquids in narrow tubes.

Poiseuille is believed to be the first to have used the #mercury #manometer to measure #bloodpressure with his invention, the #hemodynamometer, an improved method for measuring blood pressure.

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