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Chapter 14  Fluids
•
Pressure variation with
height or depth
•
Pascal’s Principle
•
Archimedes Principle
•
Fluid Flow
•
Bernoulli’s Equation
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View Full Document Fluid
•
Matter that cannot
maintain its own shape
and therefore flows
readily under the influence
of forces
–
Gases – Do not maintain
their size (volume)
–
Liquids – Do maintain their
size – “incompressible”
•
Solids maintain both their
size and shape under the
influence of forces
Density
•
Which is heavier, wood or iron?
•
Amount of mass per unit volume
•
Compressible  Density easily altered
•
Incompressible  Density varies only slightly or
not at all.
•
Specific Gravity  ratio of the density of a
material to that of water
m
V
ρ =
2
H O
3
3
g
kg
1
1000
cm
m
ρ
=
=
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•
The normal force per unit
area that a fluid exerts on
the walls of its container,
adjacent fluids or other
boundaries.
•
Units:
N/m
2
= 1 Pascal
–
1 Bar = 10
5
Pa
–
1 atm = 1.013 x 10
5
Pa
–
1 atm = 14.7 lb/in
2
–
1 atm = 760 Torr (mm Hg)
F
P
A
=
Variation of pressure with height (depth)
( 29
G
dF
dm g
gdV
gAdy
=
= ρ
= ρ
r
( 29
PA
P dP A
gAdy
0

+
ρ
=
dP
g
dy
= ρ
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View Full Document Variation of pressure with height (depth)
dP
gdy
= ρ
2
2
1
1
P
y
P
y
dP
gdy
=  ρ
∫
∫
( 29
2
1
2
1
P
P
g y
y

= ρ

0
P
P
gh
=
+ ρ
Problem 1 – What is the pressure at the faucet?
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This note was uploaded on 10/28/2009 for the course PHYS SP211 taught by Professor Idk during the Fall '08 term at Naval Academy.
 Fall '08
 IDK
 Physics, Force

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