ch12 - Chapter 12 Temperature and Heat 12.1 Common...

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Unformatted text preview: Chapter 12 Temperature and Heat 12.1 Common Temperature Scales Temperatures are reported in degrees Celsius or degrees Fahrenheit . Temperatures changed, on the other hand, are reported in Celsius degrees or Fahrenheit degrees: F 5 9 C 1 = 12.1 Common Temperature Scales Example 1 Converting from a Fahrenheit to a Celsius Temperature A healthy person has an oral temperature of 98.6 o F. What would this reading be on the Celsius scale? F 6 . 66 F 32 F 98.6 =- degrees above ice point ( 29 C . 37 F C 1 F 6 . 66 5 9 = C . 37 C . 37 C = + ice point 12.1 Common Temperature Scales Example 2 Converting from a Celsius to a Fahrenheit Temperature A time and temperature sign on a bank indicates that the outdoor temperature is -20.0 o C. Find the corresponding temperature on the Fahrenheit scale. ( 29 F . 36 C 1 F C . 20 5 9 = degrees below ice point F . 4 F . 36 F . 32 - =- ice point 12.2 The Kelvin Temperature Scale 15 . 273 + = c T T Kelvin temperature 12.2 The Kelvin Temperature Scale A constant-volume gas thermometer . 12.2 The Kelvin Temperature Scale absolute zero point = -273.15 o C 12.3 Thermometers Thermometers make use of the change in some physical property with temperature. A property that changes with temperature is called a thermometric property . 12.4 Linear Thermal Expansion NORMAL SOLIDS 12.4 Linear Thermal Expansion o L L ∝ ∆ 12.4 Linear Thermal Expansion LINEAR THERMAL EXPANSION OF A SOLID The length of an object changes when its temperature changes: T L L o ∆ = ∆ α coefficient of linear expansion Common Unit for the Coefficient of Linear Expansion: ( 29 1 C C 1- = 12.4 Linear Thermal Expansion 12.4 Linear Thermal Expansion Example 3 The Buckling of a Sidewalk A concrete sidewalk is constructed between two buildings on a day when the temperature is 25 o C. As the temperature rises to 38 o C, the slabs expand, but no space is provided for thermal expansion. Determine the distance y in part (b) of the drawing. 12.4 Linear Thermal Expansion ( 29 [ ] ( 29 ( 29 m 00047 . C 13 m . 3 C 10 12 1 6 = × = ∆ = ∆-- T L L o α ( 29 ( 29 m 053 . m 00000 . 3 m 00047 . 3 2 2 =- = y 12.4 Linear Thermal Expansion Example 4 The Stress on a Steel Beam The beam is mounted between two concrete supports when the temperature is 23 o C. What compressional stress must the concrete supports apply to each end of the beam, if they are to keep the beam from expanding when the temperature rises to 42 o C? 12.4 Linear Thermal Expansion ( 29 ( 29 [ ] ( 29 2 7 1 6 2 11 m N 10...
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This note was uploaded on 02/20/2010 for the course PHYSC 210 taught by Professor Uscinski during the Summer '09 term at American.

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ch12 - Chapter 12 Temperature and Heat 12.1 Common...

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