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Microsoft PowerPoint - INTRODUCTION TO HEAT TRANSFER

Microsoft PowerPoint - INTRODUCTION TO HEAT TRANSFER -...

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INTRODUCTION INTRODUCTION INTRODUCTION TO HEAT TO HEAT TRANSFER Course By : Prof. Course By : Prof. Mohajer Mohajer prepared by: S.M. S.M. rafigh rafigh 2011
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Molecules and Motion The motion of molecules produces heat The more motion, the more heat is generated
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Heat Transfer The movement of heat from a warmer object to a colder one
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Forms of heat transfer Three forms of heat transfer: Conduction Convection Radiation
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Conduction Conduction involves the transfer of heat through direct contact Heat conductors conduct heat well, insulators do not
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Convection Takes place in liquids and gases as molecules move in currents Heat rises and cold settles to the bottom
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Radiation Heat is transferred through space Energy from the sun being transferred to the Earth
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Questions What are the three types of heat transfer? How is conduction different from radiation?
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What type of heat transfer is involved? Heating a room with a fireplace Egg cooking in a frying pan Roof of a house becoming hot
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What type of heat transfer? Warm air mass bringing a change in the weather Wire getting hot from an electric appliance
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Temperature and Heat Kinetic energy is the energy of motion Temperature is the measure of the average kinetic energy of an object
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Question How is kinetic energy related to heat production?
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Thermometer A instrument used to measure temperature Thermometers commonly have alcohol (with dye) or mercury Digital thermometers have replaced older ones
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Celsius Scale Celsius is the metric scale for measuring temperature Water freezes at 0 º C and boils at 100ºC
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Kelvin scale The Kelvin scale is a metric temperature scale measured in Kelvin units (K) Formula (273+ºC)= Kelvin
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Questions What is the formula for converting a Celsius temperature to a Kelvin temperature? What is the boiling point of water on the Kelvin scale? What is the freezing point of water on the Kelvin scale?
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Absolute zero The temperature in which all molecular motion stops (0 K)
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Questions Describe absolute zero.
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