Also called Pascal's Principle | |

Pascal's law — developed by French mathematician Blaise Pascal — states that when there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container. | |

Definition of pressure: If F is the magnitude of the normal force on the piston and A is the surface area of a piston, then the pressure, P, of the fluid at the level to which the device has been submerged as the ratio of the force to area. | |

Since the pressure is force per unit area, it has units of N/m ^{2} in the SI system.Another name for the SI unit of pressure is Pascal (Pa) | |

An important application of Pascal's law is the hydraulic press. A force F _{1} is applied to a small piston of area A_{1}. The pressure is transmitted through a liquid to a larger piston of area A_{2}. Since the pressure is the same on both sides, we see that P = F_{1}/A_{1} = F_{2}/A_{2}. Therefore, the force F_{2} is larger than F_{1} by multiplying factor A_{2}/A_{1}. Hydraulic brakes, car lifts, hydraulic jacks, and forklifts all make use of this principle. | |

### Pascal's Law

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