Concepts of Physics
Chapters 21 & 22
Other Chapters
Color Key
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Updated 4.9.2008
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- Thermometry/difference between heat & temperature
- Intro. to thermodynamics
- Heat Mixes: Part I lab
- Keep your lab paper so we can discuss the results Tuesday. Class participation credit awarded for conducting experiment.
- Basic thermometry (keep thermometer upright, discard thermometers with separated columns, put bulb in middle of sample)
- Heat Mixes: Part II lab
- Keep your lab paper so we can discuss the results tomorrow. Class participation credit awarded for conducting experiment.
- Compare temperature scales (°F, °C, K), absolute zero
- Thermal equilibrium
- Heat vs. temperature (aluminum foil in oven vs. steam)
- Temperature measures velocity of molecules
- Thermometers measure their own temperatures - they have to end up at equlibrium with their environment
- Heat measures total thermal energy (calorie is amount of heat needed to raise 1 g of water by 1°C)
- calorie vs Calorie
- Discuss results of Heat Mixes labs
- Specific heat capacity rate of temperature change. Low heat capacity changes temperature quickly.
- Q=mCdeltaT
- C for water is 1 cal/g°C, brass is 0.09 cal/g°C, lead is 0.03 cal/g°C
- Water's high specific heat - role in temperature near shore, perspiration, water cooling in car, water in HVAC
- Low specifc heat of coals lets you walk on them. Low specific heat of air lets you put your hand in an oven.
- Intro. to Antifreeze in the Summer? lab
Tuesday, April 2
- Antifreeze in the Summer? lab
Wednesday, April 2 and Thursday, April 3 No class due to PSSA testing
Friday, April 4
- *Mr. Flint out ill today - do alpha and lab intro today 0809
- Bridge expansion joints, Concorde expansion, old school thermostats, suspension bridge cable stretching, can't get a metal lid off a glass jar? What about filling a gas tank all the way to the top?
- Bimetallic strip: strip on handle, modern thermostats
- Intro. to Linear Expansion of Metals lab
- P. 337; 36, 1215 due
- Collect homework
- Linear Expansion of Metals lab
- Antifreeze in the Summer? lab due
- Conduction - physical contact necessary; best for solids and liquids (heat transfer for objects in contact) Different substances conduct heat better than others - metals better than nonmetals and it varies by substance - show color changing rod heat conduction demo. Air is a great insulator.
- Convection - requires a moving fluid like a liquid or gas; wind, HVAC forced air systems
- Radiation - infrared radiation. Works in a vacuum (this is how energy gets to us from the sun) or from a radiator.
- Heat rises myth.
- Demonstrate radiative heat gain and loss with colored cans. Does silver, white or black heat up and cool down the fastest?
- DVD Demos: disc 14 chapters 32 and 33
- Review concepts in this unit
Friday, April 11
- Chapters 21 & 22 test
- Read Chapters 25 & 26
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