# Le13 - ME 200 Thermodynamics I Lecture 13 Compressibility...

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ME 200: Thermodynamics I Lecture 13: Compressibility chart and factors, ideal gas model Reading: Sections 3.11-3.12; SP13, 3.100, 3.104 9/22/2010 1 ME200 Therm I Lecture 13, Prof. Mongia Professor Hukam Mongia Office Hours: MWF 9:30 to 10:30 AM in ME 83 Other times email for appointment; Phone: 765-494-5640 Course Website: https://engineering.purdue.edu/ME200/ Course Secretaries: Diana Akers (ME 84) and Marilyn Morrison (ME 100) Grader: Abhro Pal , [email protected]

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9/22/2010 ME200 Therm I Lecture 13, Prof. Mongia 2 What is an Equation of State (EOS)? 1. A relationship between pressure, temperature and specific volume (or density) of a given pure substance (may involve other properties). Usually in form p = f ( T,v ). 2. Usually valid only under a limited range (how much?) of conditions of pressure and temperature. Why do we need equations of state? 1. Property tables provide very accurate information; but need to be measured with some reference state. Most are calculated from sophisticated equations of state. 2. Use of simple relations such as ideal gas EOS and van der Waals EOS desirable for qualitative physical understanding of fluid behavior. 3. Incorporation in numerical codes for calculation of thermodynamic properties, system performance.
Ideal Gas Ideal gas is an idealized representation that has certain characteristics: No molecular volume : molecules are simply points in space. No molecular forces : molecules are on average very far apart from each other. Molecules have only elastic collisions with each other and the walls of the container which conserves linear momentum and kinetic energy. Is this possible? Not really! However, we can get very close to such behavior at very low density.

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