Do Now (2/15/12):
Define the following items as “hot” or “cold.”
Describe your reasoning for each.
1.
1.
2.
3.
4.
5.
6.
Hot tea
Iced tea
Ice
Steam
Water
The sun
2. What does the word temperature mean to you?
What would/could you measure it in?
Temperature and Thermal
Energy
2/16/11
Intro to Thermodynamics
Thermodynamics – the study of
the movement of heat
Kinetic Molecular Theory
Matter is made up of tiny
molecules that are always
in motion. In a hot body the
particles move faster and
have a greater kinetic
energy than particles in a
cooler body.
Energy
Temperature –measure of
average KE of particles in a
system.
Thermal energy – overall
energy of motion of
particles in an object
Measures of Temperature
 Farenheit (˚F)
 Celsius (˚C)
 Kelvin (K)
9(C )
F 
 32
5
K  C  273
5( F  32)
C 
9
Example:
Convert the following temperatures:
1. 12˚F=____˚C
2.0˚C=____˚F
3.10˚C=____K
Conversion Practice
Convert the following temperatures:
1. 12˚F=____˚C
2. 0˚C=____˚F
3. 10˚C=____K
4. 12K =____˚C
5. 72 K=____˚F
6. -200˚F=____K
7. 455˚F=____˚C
8. 388K=____˚C
Absolute Zero
0 K – the temperature
at which all motion
theoretically stops
(hasn’t been reached
or found yet)
Heat Transfer:
Types of Heat Transfer
 Radiation – transfer in the form of
waves
 Conduction – transfer by direct
contact
 Convection – transfer through fluids
 HEAT WILL ALWAYS FLOW FROM
A HOTTER OBJECT TO A COOLER
ONE!!!
Practice:
Work with your partner
to answer the questions
on the classwork. We will
go over it 10 minutes
before the end of class.
Questions:
 Why would a balloon get larger in the sun than if you
put it in the refrigerator? Use what you know about
temperature and thermal energy in your answer.
Questions
 Do solid objects still have thermal energy even
though they don’t move? Explain.
Questions
 Can heat flow from a cold object to a hot one? Why
or why not?
Questions
 Can an object have a temperature below 0K? Why or
why not? What happens at 0k?