Blood pressure ( related to the wall tension of artery or vein)


Blood pressure is related to the wall tension of the artery or vein, according to the Young–Laplace equation (assuming that the thickness of the vessel wall is very small as compared to the diameter of the lumen). For the thin-walled assumption to be valid the vessel must have a wall thickness of no more than about one-tenth (often cited as one twentieth) of its radius.

Related formulas


PbBlood pressure (Pa)
σ_θThe cylinder stress or "hoop stress". (Pa)
tThe wall thickness of the artery or vein (m)
rThe inside radius of the cylinder (lumen) (m)