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**Methods and Applications**

PRESSURE MEASUREMENT Methods and Applications CE319F - Elementary Mechanics of Fluids - Laboratory UT Austin

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Overview Pressure (P ) expresses the magnitude of normal force (F-N) per unit area (A-m2) applied on a surface(Crowe et al. 2005) Units: Pa(= N/m2), psi(=lbf/in2), bar (=105 Pa=100 kPa), mbar (=100 Pa=1 hPa), atm (=101.3 kPa), mmHg (or Torr), inHg, etc. Note: For every Unit: hUnit=hectoUnit=100 Unit Where Pabs : Absolute pressure Patm : Atmospheric pressure (standard is: kPa = psi=760 mmHg=29.92 inHg) Pgage : Gage pressure CE319F - Elementary Mechanics of Fluids - Laboratory UT Austin

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**Pressure Measuring Devices**

Bourdon Gage: Principles: change in curvature of the tube is proportional to difference of pressure inside from that outside the tube Applications: tire pressure, pressure at the top or along the walls of tanks or vessels CE319F - Elementary Mechanics of Fluids - Laboratory UT Austin

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**Pressure Measuring Devices**

Strain Gage Principles: ∆ P ∆ Resistance ∆ Voltage Applications: Sensors for internal combustion engines, automotive, research etc. CE319F - Elementary Mechanics of Fluids - Laboratory UT Austin

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**Pressure Measuring Devices**

Quartz Gage Piezoelectric transducers Principles: ∆ Pressure ∆ Charge ∆ Voltage Applications: measurements with high accuracy, good repeatability, high resolution. e g. Quartz Clock CE319F - Elementary Mechanics of Fluids - Laboratory UT Austin

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**Pressure Measuring Devices**

Piezoresistive Gage Digital Manometer Principles: ∆Pressure = ∆Charge = ∆Resistance = ∆Voltage Applications: Very accurate for small pressure differentials e.g. Difference between indoor and outdoor pressure CE319F - Elementary Mechanics of Fluids - Laboratory UT Austin

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**Pressure Measuring Devices**

U-tube Manometer Principles: Hydrostatic Law ∆P=ρ g h CE319F - Elementary Mechanics of Fluids - Laboratory UT Austin

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**Pressure Measuring Devices**

U-tube Manometer Mercury Water Manometer Air Water Manometer Applications: air pressure, pipe pressure, etc. CE319F - Elementary Mechanics of Fluids - Laboratory UT Austin

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UT Manometer Applet Click here to connect to UT’s Interactive Fluids Applets website CE319F - Elementary Mechanics of Fluids - Laboratory UT Austin

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Atmospheres and Conversions: 1.00 atm = 1.013 x 10 5 Pa = 101.3 kPa = 760. Torr = 14.7 psi To convert pressure: 1.Turn what you have to atm 2.Multiply.

Atmospheres and Conversions: 1.00 atm = 1.013 x 10 5 Pa = 101.3 kPa = 760. Torr = 14.7 psi To convert pressure: 1.Turn what you have to atm 2.Multiply.

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