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# Law of Laplace

Definition
• The Law of Laplace is a physical law discovered by the great French mathematician Piere-Simon Laplace (and others) which describes the pressure-volume relationships of spheres. It is used to understand physiological features of both the heart and alveoli thus justifying its categorization as a basic concept.
Law of Laplace
• Pressure = (2 x Thickness x Tension)/Radius
• Where
• Pressure = The pressure inside the sphere
• Thickness = Thickness of the sphere's wall
• Tension = Tension within the sphere's wall
Concepts
• The Law of Laplace essentially states that the tension within the wall of a sphere filled to a particular pressure depends on the thickness of the sphere. Consequently, even at a constant pressure, the tension within a filled sphere can be decreased simply by increasing the thickness of the sphere's wall.