chapter 10 thermal physics 1. temperature and the zeroth law of thermodynamics 2. thermometers and...
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Chapter 10
Thermal Physics1. Temperature and the zeroth Law
of Thermodynamics2. Thermometers and Temperature
Scales3. Thermal Expansion
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Thermal Physics What is Thermal Physics? What is Heat? What is Thermal Contact? What is Thermal Equilibrium?
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Zeroth Law of Thermodynamics
If objects A and B are separately in thermal equilibrium with a third object, C, then A and B are in thermal equilibrium with each other.
Allows a definition of temperature
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Thermometers What is a thermometer? A Mercury thermometer Gas thermometer
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Temperature Scales How does one
define a temperature Scale?
The Celsius scale The Fahrenheit
scale The Kelvin scale
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Kelvin Scale Why do we
need this scale?
What is first point?
What is triple point?
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Some KelvinTemperatures Some
representative Kelvin temperatures
Note, this scale is logarithmic
Absolute zero has never been reached
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Converting Among Temperature Scales
273.15
932
55
329
95
C K
F C
C F
F C
T T
T T
T T
T T
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Converting Among Temperature Scales –Example
1. A pan of water is heated from 25 °C to 80 °C. What is the change in temperature on the Kelvin scale and on the Fahrenheit scale?
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Thermal Expansion What is thermal expansion? Linear Expansion Area expansion Volume expansion
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Applications of Thermal Expansion – Bimetallic Strip
Thermostats Use a bimetallic strip Two metals expand differently
Since they have different coefficients of expansion
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Thermal Expansion – Example
1. A steel railroad track has a length of 30.00 m when the temperature is 0°C. What is its length on a hot day when the temperature is 40°C?
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Thermal Expansion – Example
1. A hole of cross-sectional area 100.00 cm2 is cut in a piece of steel at 20°C. What is the area of the hole if the steel is heated from 20°C to 100°C?
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Unusual Behavior of Water