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General Physics
Pressure
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Created by
Robin Jack
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Cards (6)
Pressure is the force per unit area:
Pr
e
s
s
u
r
e
(
P
a
)
=
\Pr essure\ \left(Pa\right)\ =
Pr
ess
u
re
(
P
a
)
=
F
o
r
c
e
(
N
)
A
r
e
a
(
m
2
)
\ \frac{Force\ \left(N\right)}{Area\ \left(m^2\right)}
A
re
a
(
m
2
)
F
orce
(
N
)
or
P
=
P\ =
P
=
F
A
\ \frac{F}{A}
A
F
The unit of pressure is Pascals:
P
a
=
Pa\ =
P
a
=
N
m
2
\ \frac{N}{m^2}
m
2
N
In liquids:
Pr
e
s
s
u
r
e
(
P
a
)
=
\Pr essure\ \left(Pa\right)\ =
Pr
ess
u
re
(
P
a
)
=
D
e
n
s
i
t
y
(
k
g
m
3
)
x
G
r
a
v
i
t
y
(
m
s
2
)
x
H
e
i
g
h
t
(
m
)
\ Density\ \left(\frac{kg}{m^3}\right)\ x\ Gravity\ \left(\frac{m}{s^2}\right)\ x\ Height\ \left(m\right)
De
n
s
i
t
y
(
m
3
k
g
)
x
G
r
a
v
i
t
y
(
s
2
m
)
x
He
i
g
h
t
(
m
)
As the depth of a fluid increases, the
pressure
caused by the whole liquid increases.
The
manometer
:
Measures the pressure difference between a liquid and the atmosphere
The height difference shows the excess pressure in addition to the atmospheric pressure
Barometer
:
Tube with vacuum at the top and mercury filling the rest
Pressure of the air pushes down on reservoir, forcing mercury up the tube
Measure height of the mercury
~760mm of mercury is 1 atm