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## Pascal's lawIn the physical sciences, ## Additional recommended knowledgeThe difference of pressure due to a difference in elevation within a fluid column is given by:
where, using SI units,
ρ is the fluid density (in kilograms per cubic meter); g is sea level acceleration due to Earth's gravity (in meters per second squared);
The intuitive explanation of this formula is that the change in pressure between two elevations is due to the weight of the fluid between the elevations.
## Applications- Pascal's principle underlies the hydraulic press.
- Used in artesian wells, water towers, and dams.
- 'Pascal's burst barrel demonstration': a long and narrow vertical pipe is connected to the contents of a large, sealed barrel. Adding water to the pipe increases the pressure throughout the system. Adding a small amount of water to the pipe is enough to burst the barrel. Scuba divers must understand this principle. At a depth of 10 meters under water, pressure is twice the atmospheric pressure at sea level, and increases by about 100 kPa for each increase of 10 m depth.
- Atmospheric pressure diminishes with height, a fact first verified on the Puy-de-Dôme and the Saint-Jacques Tower in Paris, on the instigation of Blaise Pascal himself. Following the explanation given above, as height increases the mass of air above each unit of surface area decreases.
## See also- Fluid statics
- Pascal's contributions to the physical sciences
Categories: Hydrostatics | Fluid mechanics |

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Pascal's_law". A list of authors is available in Wikipedia. |