Heat, Temperature, Thermal Energy Heat, Temperature, and Heat, Temperature, Thermal Energy
Thermal Energy Total potential and kinetic energy associated with the random motion and arrangement of the particles of a material! Not concerned with the kinetic energy of the object itself!!
Heat Thermal Energy that is absorbed, given up, or transferred from one substance to another. It is thermal energy on the move!!
I thought temperature was how hot or cold it is? Measure of the average kinetic energy of the particles in a sample of matter!! Well, It is sort of…… I thought temperature was how hot or cold it is?
Relationship between Heat and Temperature: Video Video Which beaker is hotter? Which beaker gives off more heat? 80 oC 80 oC Which could melt more ice? Temperature is the same, amount of heat is different!!
Which has a higher temperature? 10 oC 30 oC 50 oC 80 oC A B C D
Which gives off more heat? 10 oC 10 oC 10 oC 10 oC A B C D
Relate heat and temperature Is it possible for an object to be at a high temperature, and give off little heat? ? Thimble full of really hot water!!!
Relate heat and temperature Is it possible for an object to be at a high temperature, and give off lots of heat? ?
Relate heat and temperature Is it possible for an object to be at a low temperature, and give off little heat? ?
Relate heat and temperature Is it possible for an object to be at a low temperature, and give off lots of heat? ?
Relate Heat and Temperature When a substance is “hot”, it has more thermal energy that when it is cold! Temperature is a measure of the ability to give up heat to and absorb heat from another substance!!
The temperature of a “spark” is about 2000 oC. That is HOT!!!!! How much thermal energy does a spark have? How much heat can it “give off”!!
Heat Flow Heat always flows from a substance with a high temperature to a substance with a low temperature even if lower temperature substance has more thermal energy!!
What do these 2 pictures have in common? Heat flow from higher to lower!!!!!
Which direction will heat flow? A to B B to A Neither Both A to B and B to A
How do you change the temperature of a substance? You change the temperature of a substance by either adding heat(raise temperature) or by removing heat(lower temperature)!!!
In which choice will heat flow fastest from Y to X? B C D
In which choice will heat flow fastest from X to Y? B C D
Specific Heat Heat required to change the temperature of a substance. Different substances have different specific heats. They conduct heat at different rates!! Consider Sand and Water!!! Think about the beach! Land breezes and Sea breezes!! Video
Specific Heats of some common substances: Specific Heat in J/g oC Water 4.18 Iron .450 Lead .13 Silver .245 Copper .390 Aluminum .900
Things with a low specific heat, get Hot fast, but also cool fast!! The higher the specific heat, the more heat required to change temperature!! Things with high specific heats take a long time to heat up and a long time to cool down!! Things with a low specific heat, get Hot fast, but also cool fast!!
P. 163 # 1-5 In Notebook Notetaking Skills Worksheet