# PRESSURE MEASUREMENT

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 Author: ctransam ID: 270513 Filename: PRESSURE MEASUREMENT Updated: 2014-04-14 14:03:44 Tags: Pressue INSTRUMENTATION MEASUREMENT Folders: Engineering Description: Questions regarding pressure measurements Show Answers:

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1. Density
• Density is the mass per unit
• volume. Weight is directly proportional to density.

2. Specific Gravity
• Specific gravity is a ratio of the density of a fluid/gas to the density of water/air at a certain temperature.
3. Atmospheric Pressure Units
• mm Hg
• “Hg
• 14.7 psia standard
4. Absolute Pressure Units
• psia
• “Hga
5. Differential Pressure Units
• psid
• “H2O
• “Hg
6. psid
Pounds per square inch differential
7. psig
Pounds per square inch gage
8. psiv
Pounds per square inch vacuum
9. psi
pound per square inch
10. mm Hg
Millimeters of mercury at 32°F
11. ″ Hga
Inches of mercury absolute
12. psia
Pounds per square inch absolute
13. Bernoulli's euation
• v is the fluid flow speed at a point on a streamline,
• g is the acceleration due to gravity,
• z is the elevation of the point above a reference plane, with the positive z-direction pointing upward – so in the direction opposite to the gravitational acceleration,
• is the pressure at the chosen point, and
• ρ is the density of the fluid at all points in the fluid.
•  v is the fluid flow speed at a point on a
• streamline,
• • g is the acceleration due to gravity,
• • z is the elevation of the point above a reference plane, with the positive z-direction pointing upward – so in the direction opposite to the gravitational acceleration,
• • p is the pressure at the chosen point, and
• • ρ is the density of the fluid at all points in the fluid.
15. Open Vessels
16. Closed Vessels
17. Boyle’s Law
18. Charle’s Law
19. Ideal Gas Law
• P is the pressure of the gas
• V is the volume of the gas
• m (n) is the amount of substance of gas (also known as number of moles)
• R is the ideal, or universal, gas constant, equal to the product of the Boltzmann constant and the Avogadro constant.
• T is the temperature of the gas

In SI units, P is measured in pascals, V is measured in cubic metres, n is measured in moles, and T in kelvins (273.15 kelvins = 0.00 degrees Celsius). R has the value 8.314 J·K−1·mol−1 or 0.08206 L·atm·mol−1·K−1 if using pressure in standard atmospheres (atm) instead of pascals, and volume in liters instead of cubic metres.
20. Pressure Definition
Pressure is the measure of the amount of force exerted by a fluid or gas per unit of area, or P=F/A.
21. Absolute Pressure Definition
• the sum of atmospheric and gage pressures or the absolute pressure is the atmospheric pressure minus vacuum pressure:
• Pa= Patm + Pg
• Pa= Patm - Pv
22. Total Pressure Definition
• the sum of static and dynamic pressures:
• Pt= Ps + Pd

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