PHYSICS & TEMPERATURE BLVCK IV
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________ is a dominant factor in determining the physical properties or state of matter.
What can change the state of matter?
Boiling Point = 212 degrees
Freezing Point = 32 degrees
Boiling Point = 373 degrees
Freezing Point = 273 degrees
All molecular activity ceases at absolute zero.
-Increase in pressure will cause an increase in temperature
Temperature/Pressure relationship in a closed container
-Pressure increases will raise boiling point
-Pressure can chance the state, but not dominate factor
Pressure/Boiling Point relationship in a closed container
-Caused by movement of molecules
Form of Energy
Joules, Calories, & BTU’s
Measurements of heat
-Water is the standard
-Water has a value of one
-Heat required to change one pound of a substance one degree
____ is required to change the temperature of one pound of water by one Fahrenheit.
-Governs heat transfer
-States, heat travels from hot to cold
- HEAT SEEKS COLD
2nd Law of Thermodynamics
Conduction, through _____ objects, requires a medium
Convection, through _____ objects, requires a medium
Radiation, through _____ , doesn’t require a medium
Controlling Heat Transfer: May be desired through -
- -Heat exchanger
- -Controlling air temperature
• Radiation turned away by reflective material such as paint
-Conduction reduced by a poor conductor such as stainless steel
-Convection eliminated by a vacuum such as between two tanks
How Heat Transfer is Eliminated;
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