Chapt 10

Chapt 10 - Temperature and Kinetic Theory Chapter 10 Heat...

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1 Temperature and Kinetic Theory Chapter 10 Heat and Thermal Equilibrium c What is Heat? c Heat is energy in motion . i.e. in transit. c Transferred from one object to another because of a temperature difference c Objects exchanging heat are said to be in thermal contact c When they are at the same temperature , they are said to be in thermal equilibrium Temperature and Heat c What is temperature? c Temperature is a relative measure of “hotness” or “coldness” c Its measurement uses some property of matter that is affected by temperature. c e.g. Pressure, expansion, electrical resistance, etc.

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2 Temperature and Molecular Motion c On a microscopic level temperature is associated with molecular motion c Temperature is a measure of the average translational energy of molecules Celsius Scale c Used everywhere outside of USA c Scale tied to the freezing point and boiling point of water c Temperature of the freezing point is defined as 0º C c Temperature of the boiling point is defined as 100º C c The range is divided into 100 segments Fahrenheit Scale c Most common scale used in the US c Scale tied to the freezing point and boiling point of water c Temperature of the freezing point is defined as 32º F c Temperature of the boiling point is defined as 212º F c The range is divided into 180 segments
3 Celsius and Fahrenheit Temperature Scales c T F = (9/5)T C + 32 c T C = (5/9)[T F – 32] c They share a common temperature at -40 o Celsius and Fahrenheit Temperature Scales c Plot T F and T C vs T C T F = (9/5)T C + 32 and T C = T C c T C = T F at -40 o 100 80 60 40 20 0 20 40 60 80 100 100 80 60 40 20 0 20 40 60 80 100 120 140 160 180 200 220 220 100 - T F T C 100 100 - T C o F vs o C c T F = (9/5)T C + 32 c T F = 1.8T C + 32 c T C = (5/9)[T F – 32]

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4 Example 10-1 c Given T C = 20 o C and -18 o C Find T
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This note was uploaded on 01/05/2012 for the course PHYS 1401 taught by Professor Jamesr.boyd during the Spring '09 term at Collins.

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Chapt 10 - Temperature and Kinetic Theory Chapter 10 Heat...

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