Understanding Pressure in Thermodynamics
"Learn about pressure as a state property in thermodynamics, its definition, measuring methods like manometers and barometers, and essential concepts related to pressure units. Enhance your knowledge of this key thermodynamic parameter."
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Presentation Transcript
Thermodynamics Ch 2 : Basic Concepts 6. State property: Pressure Thermodynamics Prof. Mohamed Nabil Sabry 1
Defining Pressure Force due to the impact of molecules on the wall F A = limA P Definition of pressure: 0 After you! 0 Specific (Intensive) Property A SI Units: Pa = N / m2 = kg/ms2 Other units M Pa = 106 Pa; bar =105 Pa; atm = 1.013 bar; psi = 1lb/in2= 6.8948 kPa torr = 1mmHg=133.32 Pa Thermodynamics 2
Measuring Pressure P An example for low P Manometer Relative Pressure gauge (+ ou -) Absolute Pressure > 0 Patm Pabs h Atmospheric Pressure 0 Pabs Patm = Pgauge= g h An example for high P: Bourdon to measure Patm: Barometer: Patm against vacuum P Thermodynamics 3
Summary Pressure is a specific (intensive) property, always > 0 We can only measure pressure difference P gauge = P absolute P atm(can be +ve or -ve) Pressure units Pa, bar, atm, psi, torr Thermodynamics 4
