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Fluids and
Bernoulli’s Equation
Prof. John Conway
Physics 7B  Lecture 1
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View Full Document imagine a cube,
1 meter on a side.
..
1 liter = 1000 cm
3
= 1000 ml
1 m
3
= 1000 liter
1 cm
3
= 1 ml
1 kg H
2
O
1000 kg H
2
O
Density
•
we can think of density as the amount of
something per unit volume
•
mass density = kg/m
3
•
usually use Greek symbol rho =
ρ
(not p !)
density of water
ρ
water
= 1000 kg / m
3
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View Full Document Pressure
•
weight = force of gravity = mg
(g = 9.8 m/s
2
)
•
pressure = force per unit area
•
what is the pressure at the bottom of our cubic
meter of water?
weight of cube
(1000 kg)(9.8 m/s
2
)
= 9800 N
pressure on bottom
9800 N/m
2
= 9800 Pa
Pressure
•
what if we just had a narrow column?
Would
the pressure at the bottom be the same?
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View Full Document Fluid Pressure
•
pressure is force
per unit area
•
in a fluid,
pressure pushes
in all directions
•
pressure varies
with depth in a
gravitational
field: need to
hold up column of
fluid above!
force = weight = mg =
ρ
Adg
pressure = force/area =
ρ
gd
Atmospheric Pressure
•
atmospheric pressure at sea level:
1 atm = 101325 Pa
•
also measured in bars (1 bar = 1 atm),
760 mmHg = 760 torr, .
..
In our discussions always remember that
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This note was uploaded on 03/30/2010 for the course PHY 7 taught by Professor Staff during the Spring '08 term at UC Davis.
 Spring '08
 Staff
 Physics

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