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eml 3100 lec 3

# eml 3100 lec 3 - Thermodynamics UNIVERSITY OF As FLORIDA we...

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Lecture No. 3 1 UNIVERSITY OF FLORIDA Thermodynamics As we have seen on the psychrometric chart, temperature and pressure are important intensive properties. They are used in many thermodynamic calculations.

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Lecture No. 3 2 UNIVERSITY OF FLORIDA Thermodynamics Pressure Force exerted by a fluid per unit area. Units: Pascal, Pa = 1 N/m 2 Generally use kPa or MPa 1 atm pressure = 14.7 psia = 34 ft water = 760 mm Hg = 101.3kPa = 29.92 in. Hg, etc In this class, kPa, MPa or psi (doesn’t really violate rule that all names are capitalized but M is capital here also and stands for 1,000,000…my days in chemistry we didn’t use cap M…convention now is to use cap M
Lecture No. 3 3 UNIVERSITY OF FLORIDA Thermodynamics Absolute vs Gage Pressure Pabs = Pgage + Patm e.g. psia = psig + 14.7 for a standard atmosphere If a gage located in Gainesville reads, 20 psig then the absolute pressure is 20 + 14.7 or 34.7 psia For thermodynamic relationships get accustomed to using absolute pressure. You’ll see this become more important as we consider ideal gases.

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Lecture No. 3
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eml 3100 lec 3 - Thermodynamics UNIVERSITY OF As FLORIDA we...

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