MAE 204 Lecture Notes - Lecture 2: Lead, Pressure Measurement, Enthalpy

• School: University at Buffalo
• Department: Mechanical & Aerospace Engr
• Course: MAE 204
• Professor: Salac David

Document Summary

Proporties something with a numeric value that can be deterned with knowledge of the system"s history. To transform an extensive property into an intensive one, divide by the mass of the system. Ex:)volume-m^3 -extensive specific volume, c= (m^3)/kg --- intensive specific enthalpy = kj/kg we want specific properties because there a thing call state postulate. The stateof a simple comprossible system is completely defined by two independent, intensive properties. Phase (liquid,gas,etc ) it"s temperture,pressure,specific volume, specific enthalpy, specific entropy. Simple compressible: any system without gravitational, electrical, magnetic,tension or bulk motion energies. Independent: can i cary one property while the other property is held constant. Some properties can be both independent and dependent depending on the phase. Pure solid, pure liquid, pure gas--independent. solid - liquid transition, liquid - gas transition ---- dependent use of stat postulate water at 300c at pressure 4mpa that, c = 0. 05887m^3 / kg u = 2726. 2 kj/ kg.