The Big Ideas—Chapter 15
(Serway and Beichner, Physics for Scientists and Engineers, 5
th
Edition)
AJM:1/15/01
1
Sections 1
Pressure is a measure of the force per unit area that a fluid
exerts on whatever confines it.
Note that the pressure at any point
within
a fluid can be
determined from the force per unit area exerted by the fluid in
that region on the neighboring portions of the
same
fluid which
are, after all, what confines it!
The pressure within a fluid can have different values at different
spatial locations (like temperature and density) and is an
example of what is called a “scalar field”—“field” because it
takes on different values at different spatial locations, “scalar”
because it is a scalar quantity (to be contrasted with, for
instance, the
gravitational
field which is a
vector
field.)
Fluid pressure creates a force that is
perpendicular
to any
surface under consideration and
away
from the fluid that is
producing the force.
P
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 Spring '08
 IdontKnow
 Physics, Fluid Dynamics, Fluid Mechanics, Force, static fluid increases, different spatial locations

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