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# What is 1 Pa of pressure?

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### Explain Pascal's law?

Pascal's Law states that when there is an increase in pressure
at any point in a confined fluid/liquid, there is an equal increase
at every other point in the container.
Example : In a container that contains a fluid. In a certain
point # 1 the pressure is 1 Pa, in point # 2 the pressure is 3 Pa
and at point # 3 the pressure is 5 Pa.
Now, a pressure of 10 Pa was added, therefore the resulting
pressures in points #1, # 2 # 3 are 11 Pa, 13 Pa and 15 Pa
respectively.
Hope this clarifies your question.

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### How do you find gauge pressure from absolute pressure?

The pressure in a fluid is defined as
"the normal force per unit area exerted on a imaginary or
real plane surface in a fluid or a gas"
The equation for pressure can expressed as:
p = F / A (1)
where
p = pressure [lb/in2 (psi) or lb/ft2 (psf), N/m2 or
kg/ms2 (Pa)]
F = force [1), N]
A = area [in2 or ft2, m2]
1) In the English Engineering System special care must be taken
for the force unit. The basic unit for mass is the pound mass
(lbm) and the unit for the force is the pound (lb) or
pound force (lbf).
Absolute
Pressure
The absolute pressure - pa - is measured relative to
the absolute zero pressure - the pressure that would
occur at absolute vacuum. All calculation involving the gas laws
requires pressure (and temperature) to be in absolute units.
Gauge Pressure
A gauge is often used to measure the pressure difference
between a system and the surrounding atmosphere. This pressure is
often called the gauge pressure and can be expressed as
pg = ps - pa (2)
where
pg = gauge pressure
ps = system pressure
pa = atmospheric pressure
Atmospheric
Pressure
Atmospheric pressure is pressure in the surrounding air at - or
"close" to - the surface of the earth. The atmospheric pressure
vary with temperature and altitude above sea level.
Altitude and Air Density
Standard Atmospheric
Pressure
Standard Atmospheric Pressure (ATM) is used as a
reference for gas densities and volumes. The Standard Atmospheric
Pressure is defined at sea-level at 273oK (0oC) and is
1.01325 bar or 101325 Pa (absolute). The
temperature of 293oK (20oC) is also used.
In imperial units the Standard Atmospheric Pressure is 14.696
psi.
1 ATM = 1.01325 bar = 101.3 kPa = 14.696 psi (lbf/in2)= 760
mmHg =10.33 mH2O = 760 torr = 29.92 inHg = 1013 mbar = 1.0332
kgf/cm2 = 33.90 ftH2O
Pressure Units
Since 1 Pa is a small pressure unit, the unit hectoPascal (hPa) is
widely used, especially in meteorology. The unit kiloPascal (kPa)
is commonly used design of technical applications like HVAC
systems, piping systems and similar.
1 hectoPascal = 100 Pascal = 1 millibar
1 kiloPascal = 1000 Pascal
Some Pressure
Levels
10 Pa - the pressure below 1 mm of water
1 kPa - approximately the pressure exerted by a 10
g of mass on a 1 cm2 area
10 kPa - the pressure below 1 m of water, or the drop in
air pressure when moving from sea level to 1000 m elevation
10 MPa - nozzle pressure in a "high pressure"
washer
10 GPa - pressure enough to form diamonds
Some Alternative Units of
Pressure
1 bar - 100,000 Pa
1 millibar - 100 Pa
1 atmosphere - 101,325 Pa
1 mm Hg - 133 Pa
1 inch Hg - 3,386 Pa
A torr (torr) is named after Torricelli and is the
pressure produced by a column of mercury 1 mm high - equals
to 1 / 760th of an atmosphere.
1 ATM = 760 torr = 14.696 psi
Pounds per square inch (psi) was common in U.K. but has
now been replaced in almost every country except in the U.S. by the
SI units. Since atmospheric pressure is 14.696 psi - a column of
air on a area of one square inch area from the Earth's surface to
the space - weights 14.696 pounds.
The bar (bar) is common in the industry. One bar is
100,000 Pa, and for most practical purposes can be approximated to
one atmosphere even if
1 Bar = 0.9869 ATM
There are 1,000 millibar (mbar) in one bar, a unit common
in meteorology.
1 millibar = 0.001 bar = 0.750 torr = 100 Pa