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Energy and MatterChapter 6 Lesson 2Mr. Nigh Science 7
Energy TransferMethods
Methods of Heat Transfer
Conduction is the transfer of heat energy between objects in direct contact
Convection is the transfer of heat energy by the movement of liquids or gasses
Radiation is the transfer of heat energy by electromagnetic waves
Conduction
Conduction is the transfer of heat by direct particle to particle contact
Ouch
ConductionConduction
Heat in conduction always travels
from high to low temperature
What happens when you hold chocolate in your hand?
It Melts
Why?
Heat from your hand
Transfers into the cooler chocolate
Thermal ConductorA Thermal Conductor is a material through
which thermal energy flows easily
copper Gold
Thermal Insulator
• A Thermal insulator is a material through which thermal energy is stopped or slowed
Rubber Glass
Specific HeatSpecific Heat is the amount of thermal energy
required to increase the temperature of 1Kg of a material by 1 degree Celsius.
Because water has a High Specific Heat, it is a great coolantfor an internal combustion engine
Thermal Contraction
Thermal Contraction is a decrease in a material’s volume when its temperature decreases
A liquid thermometergoes down whenthe temperaturegoes down
Thermal ExpansionThermal expansion is an increase in the
material’s volume when its temperature increases
When workers tried toplace the middle piece
on a hot July day,
It wouldn’t fit
Convection is the transfer of heat by the movement of a liquid or gas
smoke
Current
RadiationRadiation is the transfer of heat through
electromagnetic waves
Name the typeof
Energy Transfer