Thermodynamics of Materials
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1 Thermodynamics of Materials 2nd Lecture (Wed.) Temperature Scale After thermometers were invented, different thermometers used different temperature scales. Standardization was necessary. Invent it yourself with the background knowledge of the 17 th century. What are the most important factors? 1. Fixed points 2. Within temperature domain of practical interest
2 G.D. Fahrenheit (Gdansk 1686, Hague 1736) Three fixed points 1. Zero degrees at the temperature of an ice, water, and salt mixture in equal amounts F at the equil. temperature of the water-ice mixture F at the temperature in the mouth or under the armpit of a living man in good health. After Fahrenheit died in 1736, scientists calibrated his model of thermometer using 212 degrees, the temperature at which water boils, as the upper fixed point. When the Fahrenheit thermometer was recalibrated, normal human body temperature registered 98.6 rather than 96. A. Celsius (Uppsala 1701, Uppsala 1744 ) For his meteorological observations he constructed his world famous Celsius thermometer, with 0 for the boiling point of water and 100 for the freezing point. After his death in 1744 the scale was reversed to its present form. From the scientific point of view the most important contribution to the modern temperature scale is due to Celsius because of his careful experiments on the fixed points.
3 2. Pressure What is pressure? How can you measure atmospheric pressure with the background knowledge of the 17 th century? Evangelista Torricelli (Faenza 1608 Florence 1647)
4 Pressure Force/Area units Pascal = Newton/m 2 = Joule/m 3 atmosphere = Pa = ~ 0.1 MPa bar = Pa atmosphere = 760 mm Hg = 760 torr h What do we have in the upper part of the flask? discovery of vacuum Guericke's famous experiment with the Magdeburg hemispheres in Otto von Guericke was mayor of Magdeburg, Bavaria.
5 Robert Boyle ( ) J-Tube experiment
6 Robert Boyle ( ) J-Tube experiment sck/czhx/czhx10/h10-62e.jpg PV = constant Boyle s Law (at constant T)
7 Introduction/front.gif Jacques Charles ( )
8 How far the volume can decrease with decreasing temperature? Joseph Louis Gay-Lussac By excluding water vapor from the apparatus and by making sure that the gases themselves were free of moisture, he obtained results that were more accurate than had been obtained previously by others. He concluded that equal volumes of all gases expand equally with the same increase in temperature, indicating that thermal expansion coefficients of all permanent gases are the same. He calculated the temperature of zero gas volume to be o C.
9 What is the thermal expansion coefficient of ideal gas? V = V o (1 + αt) At o C, V should be zero. α = 1 273
10
11 How do you interpret Gay-Lussac s data: thermal expansion coefficients of all permanent gases are the same? Amadeo Avogadro interpreted Gay-Lussac's data Avogadro's hypothesis: Equal volumes of gases at the same temperature and pressure contain equal numbers of molecules Gay-Lussac combined his law with Boyle s law of ideal gases and produced the Ideal Gas Law. PV = nrt
12 Why does temperature drop in adiabatic expansion? (physical meaning) How do we make artificial snow? (ex. in the ski resort)
13 Pierre Simon Laplace ( ) Phenomenon observed in Bohemian salt mine Compressed air was released from a water pipe and the air was released from a water pipe and the air became so cold that snow condensed out of it. Adiabatic Effect γ PV = Const. CP γ = C V How can you make rough vacuum easily and repeatedly for removing water in the mine?
14 Savery s Steam Pump (1698) (Image Research Machines plc) Newcomen s Engine (1712) (Image Research Machines plc) Thomas Newcomen's steam engine, invented in 1712, was the first practical steam engine and was used to power pumps in the tin mines of Cornwall and the coal mines of northern England. Steam from the boiler entered the cylinder as the piston moved up (pulled by the weight of a wooden beam). Water from a tank was then sprayed into the cylinder, condensing the steam and creating a vacuum so that air pressure forced down the piston and activated the pump.
15 (1712) James Watt s Engine (1769) James Watt ( ) James Watt's steam engines, dating from 1769, were an improvement on that of Thomas Newcomen in that they had a separate condenser and permitted steam to be admitted alternately on either side of the piston. (Image Research Machines plc)
16 One Sunday afternoon in May 1765 Watt went for a walk on Glasgow Green. As he put it, 'I had not walked further than the golf-house when the whole thing was arranged in my mind': the engine needed a separate condenser / Those who make engines are called engineer.
17 Joseph Black Lecturer in Chemistry, Glasgow University, fundamental work on latent and specific heats He understood that heat is different from hotness. Using the newly-developed thermometers, he showed that in thermal equilibrium, the temperature of all the substances are the same. This idea was not easily accepted. Why? Contradict the ordinary experience of touch: a piece of metal feels colder than a piece of wood, even after they have been in contact for a very long time. (thermal equilibrium) Why does a piece of metal feel colder?
18 Black discovered specific heat of substances. 540 cal/gm (H 2 O) why? 80 cal/gm (H 2 O) /thermodynamics/tempheat.html Caloric Theory of Heat Served as the basis of thermodynamics. Is now known to be obsolete Based on the following assumptions 1. Heat is a fluid that flows from hot to cold substances. 2. Heat has a strong attraction to matter which can hold a lot of heat. 3. Heat is conserved. 4. Sensible heat causes an increase in the temperature of an object when it flows into the object. 5. Latent heat combines with particles in matter (causing substances to melt or boil) 6. Heat is weightless. The only valid part of the caloric theory is that heat is weightless. Heat is NOT a fluid, as it is NOT conserved. /thermodynamics/tempheat.html
19 Benjamin Thomson, Count Rumford ( ) Frictional heat appears to be inexhaustible, it is given off in a constant flux in all directions without interruption or intermission and without any signs of exhaustion. It is hardly necessary to add that anything which any insulated body or system of bodies can furnish without limitation cannot possibly be a material substance; and it appears to me to be extremely difficult, if not impossible, to form any distinct idea of anything being excited and communicated in these experiments, except it be motion. Count Rumford
20 In 1803, Lazare Carnot wrote an article on potential energy. In 1784, he wrote his first mathematical work on mechanics, which contains the earliest proof that kinetic energy is lost in the collision of imperfectly elastic bodies.
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