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carLORENZ0
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________ is a dominant factor in determining the physical properties or state of matter.
Temperature
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What can change the state of matter?
Temperature
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Boiling Point = 212 degrees
Freezing Point = 32 degrees
Fahrenheit
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Boiling Point = 373 degrees
Freezing Point = 273 degrees
Kelvin/Absolute
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All molecular activity ceases at absolute zero.
Fundamental Constant
Absolute Zero
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-Directly Proportional
-Increase in pressure will cause an increase in temperature
Temperature/Pressure relationship in a closed container
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-Directly Proportional
-Pressure increases will raise boiling point
-Pressure can chance the state, but not dominate factor
Pressure/Boiling Point relationship in a closed container
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-Caused by movement of molecules
Form of Energy
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Joules, Calories, & BTU’s
Measurements of heat
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-Water is the standard
-Water has a value of one
-Heat required to change one pound of a substance one degree
1 BTU
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____ is required to change the temperature of one pound of water by one Fahrenheit.
One BTU
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-Governs heat transfer
-States, heat travels from hot to cold
- HEAT SEEKS COLD
2nd Law of Thermodynamics
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Conduction, through _____ objects, requires a medium
SOILD
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Convection, through _____ objects, requires a medium
FLUID
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Radiation, through _____ , doesn’t require a medium
WAVES
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Controlling Heat Transfer: May be desired through -
- -Heat exchanger
- -Controlling air temperature
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• 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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