PRESSURE MEASUREMENT

The flashcards below were created by user ctransam on FreezingBlue Flashcards.

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

    Image Upload
  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.
    • Image Upload
  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
    • Image Upload
    • 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.
  14. Total Head or Energy Head
    • Image Upload
    •  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
    Image Upload
  16. Closed Vessels
    Image Upload
  17. Boyle’s Law
    Image Upload
  18. Charle’s Law
    Image Upload
  19. Ideal Gas Law
    • Image Upload
    • 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
Author:
ctransam
ID:
270513
Card Set:
PRESSURE MEASUREMENT
Updated:
2014-04-14 18:03:44
Tags:
Pressue INSTRUMENTATION MEASUREMENT
Folders:
Engineering
Description:
Questions regarding pressure measurements
Show Answers: