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law of La·place | \ -lä-ˈpläs 
\
\Medical Definition of law of Laplace
: a law in physics that in medicine is applied in the physiology of blood flow: under equilibrium conditions the pressure tangent to the circumference of a vessel storing or transmitting fluid equals the product of the pressure across the wall and the radius of the vessel for a sphere and half this for a tube
— called also Laplace's law
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