Section 2
Density and Pressure
By Boundless
![Thumbnail](../../../../../../figures.boundless-cdn.com/10107/square/figure-203.jpeg)
Pressure is scalar quantity which is defined as force per unit area where the force acts in a direction perpendicular to the surface.
![Thumbnail](../../../../../../figures.boundless-cdn.com/10110/square/equation-202.jpeg)
Pressure within static fluids depends on the properties of the fluid, the acceleration due to gravity, and the depth within the fluid.
![Thumbnail](../../../../../../figures.boundless-cdn.com/10152/square/figure-201.jpeg)
Any region or point, or any static object within a static fluid is in static equilibrium where all forces and torques are equal to zero.
![Thumbnail](../../../../../../figures.boundless-cdn.com/10178/square/figure-201.jpeg)
Pascal's Principle states that pressure is transmitted and undiminished in a closed static fluid.
![Thumbnail](../../../../../../figures.boundless-cdn.com/10190/square/equation-201.jpeg)
Pressure is often measured as gauge pressure, which is defined as the absolute pressure minus the atmospheric pressure.
![Thumbnail](../../../../../../figures.boundless-cdn.com/10384/square/equation-201.jpeg)
Barometers are devices used for measuring atmospheric and gauge pressure indirectly through the use of hydrostatic fluids.
![Thumbnail](../../../../../../figures.boundless-cdn.com/10390/square/equation-202.jpeg)
Pressure plays an essential role in a number of critical bodily functions including respiration and blood circulation.