lecture 2 - Thermal and Fluids Engineering I Prof Deborah A...

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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski Lecture 2 – Properties and Ideal Gases Thermophysical Properties T – temperature P – pressure V – volume m – mass ρ – density m V = v – specific volume 1 V v m = = Critical notation: V – volume V – velocity v – specific volume Lecture 2 Page 1

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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski Temperature The thermometer – mercury expands with rising temperature Fahrenheit chose two reference points - Body temperature 96 ºF (8 X 12) - Freezing point of water-salt solution 0 ºF These are not easily reproducible and precise reference points. Furthermore, the scale depends on the properties of mercury. Better reference points: - Temperature at which water boils 100 ºC - Temperature at which water freezes 0 ºC Problem: these temperatures depend on pressure Solution: choose 1 atm as the standard pressure Lecture 2 Page 2
Thermal and Fluids Engineering I Prof. Deborah A. Kaminski Gas Temperature Scale - fixed volume Gas temperature scale - fixed mass - low density Kelvin scale oo 0 K 273.15 C =− Conversion among scales () () K C 273.15 TT =+ R F 459.67 Rankine scale ( ) ( ) F1 . 8C3 2 R1 . 8K = Temperature is proportional to the average kinetic energy of the molecules in a gas. Faster speed higher temperature Lecture 2 Page 3

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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski Temperature in a liquid is also proportional to average kinetic energy but liquid molecules are closer together.
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This note was uploaded on 04/08/2008 for the course ENGR 2250 taught by Professor Borca-tasciuc during the Spring '08 term at Rensselaer Polytechnic Institute.

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lecture 2 - Thermal and Fluids Engineering I Prof Deborah A...

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