Lec03 - ME 200: Thermodynamics I Lecture 3: Temperature,...

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ME 200: Thermodynamics I Lecture 3: Temperature, Pressure Problem Solving Procedures Professor Hukam Mongia Office Hours: MWF 2:30 to 3:30 pm in ME 83 (Other times email for appointment) Email: hmongia@purdue.edu Phone: 765-494-5640 Course Website: https://engineering.purdue.edu/ME200 Course Secretaries: Diana Akers (ME 84) and Marilyn Morrison (ME 100) 8/21/2009 1
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Last Lecture Some thermodynamic definitions System Property State Equilibrium Process Cycle Energy 8/21/2009 2 Prof. Lucht's Lecture Notes Modified
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This Lecture Temperature Pressure Problem Solving Procedure 8/21/2009 3 Prof. Lucht's Lecture Notes Modified
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Temperature 0 th Law of Thermodynamics: If two bodies are in thermal equilibrium with a third body, then they are in thermal equilibrium with each other Also, to keep in mind:1 st , 2 nd and 3 rd laws of thermodynamics Properties of many substances change with temperature in a predictable manner; good for temperature measurement Two Point Scale Celsius (SI) or Fahrenheit (US Commercial or Engineering System, USCS or USES) freezing point (0 o C or 32 o F) boiling point (100 o C or 212 o F) 8/21/2009 4 Prof. Lucht's Lecture Notes Modified
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Temperature (cont.) Thermodynamic temperature scale based on 2 nd Law Two Point Scale Kelvin (SI) or Rankine (USCS) freezing point (273 K) boiling point (373 K) T(R) = 1.8 T(K) Temperature differences are identical on different scales in a given system of units T( o C) = T(K) T( o F) = T(R) 8/21/2009 5 Prof. Lucht's Lecture Notes Modified
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Temperature (cont.) T(K) = T( C) + 273.15 T(R) = T(°F) + 459.67 8/21/2009 6 Prof. Lucht's Lecture Notes Modified
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7 Kelvin temperature scale: Lord Kelvin (1824-1907) defined absolute temperature in 1847. In 1851 he published ideas leading to the second law of thermodynamics and supported his friend James Joule's mechanical equivalent of heat. He changed the view of heat as being a fluid to an understanding of the energy of motion of molecules. The term "kinetic energy" was introduced by Thomson in 1856. Absolute 0 K
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Lec03 - ME 200: Thermodynamics I Lecture 3: Temperature,...

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