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