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Published byHector McDonald Modified over 9 years ago
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Chapter 10 Heat and Temperature
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Temperature Page 324 Temperature is proportional to the average kinetic energy of an object
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Measuring Temp Thermometers –Page 325 Based on the principle that most objects expand when their temperature increases
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Measuring Temp Common Scales –Celsius –Fahrenheit –Kelvin – absolute zero
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Energy Transfer Always from higher temp to lower temp Heat – page 330
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Dr. Carlson Dr. Carlson Thermodynamics Dr. Carlson
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Methods of Energy Transfer 3 ways –Conduction –Convection –Radiation
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Conduction Page 332 Involves objects in direct contact Example: metal fork that holds marshmallow
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Convection Page 332 Movement of warm fluids – liquid or gas Convection Current Example: warm air around the campfire
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Radiation Page 333 Does not require physical contact between objects Example: heat you feel when you stand near the campfire
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Conductor Page 334 What makes a good conductor? Metals better than non- metals
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Insulators Page 335 Slow transfer of energy as heat Example: –wooden spoon
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Specific Heat Page 336 Characteristic physical property Ratio can be used to predict larger changes for masses other than 1 kg
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Using Heat Machines can transfer energy as heat from one place to another Examples? –Air Con, Fridge,
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Using Heat Conservation of Energy Energy moves from high temp to lower temp
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Air Conditioner Removes energy as heat from the warm air Transfers energy to air outside the room
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Cooling System Page 343 Often use evaporation and condensation Refrigerant – page 344
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Cooling System Liquid – Gas - Liquid Changes of state always transfer lots of energy
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Heating Systems Page 340 Transfers heat from outside to inside Need a source of energy
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Heating Systems Furnace or solar energy can be used to heat air or water solar Which can be pumped through a building to transfer energy and increase temperature
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Usable Energy Some is lost through conduction and radiation Usable energy decreases Insulation can decrease loss
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