• Why does mom use cloth to take a wok?

Example from daily life

Example from daily life

• Have you ever grip ice cub?

• What do you feel?

Example from daily life

• How does the heat flow from one place to another?

HEAT HEAT FLOWFLOWHEAT HEAT FLOWFLOW

Objective:Objective:1. To investigate the heat flow by

conduction (in solid matters), convection (in liquid and gaseous matters) and radiation

2. To identify matter classified as conductor and insulator of heat

3. To Apply the heat flow concept in solving everyday physics problems such as a vacuum flask and a flat-iron

Science word

• Conduction Conductor Insulator

• Convection

• Radiation

Heat energy flows from a warm substance to a cooler substance.Heat can be transferred by three processes:

conduction, convection, and radiation.

Information

Heat can be transferred by three processes: conduction, convection, and radiation.

Conduction is the transfer of heat along a solid object.

Convection transfers heat through the exchange of hot and cold molecules.

Radiation is the transfer of heat via electromagnetic (usually infrared) radiation.

Stone Mercury Iron

WoodGlass

Gold

Cloth

Conduction

In conduction, heat is transferred through a material by the collision of adjacent atoms or molecules

Conduction

If you look closely, what will you observe?

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Convection

In convection, particles of fluid move from one place to another carrying heat energy.

Convection

If you look closely, what will you observe?

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Radiation

Radiation is the process of transferring heat through a vacuum (without medium)

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Heat flow

Conduction Convection Radiation

Solid VacuumLiquid Gaseous

Conductor

Insulator

• What does she use if she wants to keep her hand from heat ?

Application

Application

• What do you use if you want to keep your drink cool or warm?