15.1. Pressure of Fluids http://www.ck12.org
FIGURE 15.10
How does Bernoulli’s law explain each of
these examples?see http://science.kqed.org/quest/video/the-physics-of-sailing/.
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/129625Lesson Summary
- All fluids exert pressure because their particles are constantly moving at random in all directions and bumping
into things. Pressure can be represented by the equation: Pressure=ForceArea. The SI unit for pressure is the
pascal (Pa), which equals 1 N/m^2. - Two factors that affect the pressure of fluids are depth and density. This explains why water pressure is greater
deeper in the ocean and air pressure is greatest at sea level. Denser fluids, such as water, exert more pressure
than less dense fluids, such as air. - Pascal’s law states that a change in pressure at any point in an enclosed fluid is transmitted equally throughout
the fluid. This law is the basis of hydraulic equipment, such as hydraulic car lifts. Bernoulli’s law states that
pressure in a moving fluid is less when the fluid is moving faster. This law explains how the wings of both
airplanes and birds create lift.