Transferring Thermal Transferring Thermal EnergyEnergy

ConductionConduction

Thermal energy is transferred from Thermal energy is transferred from place to place by conduction, place to place by conduction, convection, and radiation.convection, and radiation.

ConductionConduction is the transfer of is the transfer of thermal energy by collisions between thermal energy by collisions between particles in matter.particles in matter.

ConductionConduction

Thermal energy is Thermal energy is transferred when transferred when one end of a metal one end of a metal spoon is heated by spoon is heated by a Bunsen burner. a Bunsen burner.

The kinetic energy The kinetic energy of the particles of the particles near the flame near the flame increases.increases.

Kinetic EnergyKinetic Energy

Kinetic energy is transferred when Kinetic energy is transferred when these particles collide with these particles collide with neighboring particlesneighboring particles

Thermal energy is transferred by the Thermal energy is transferred by the collisions between particles, not by collisions between particles, not by movement of mattermovement of matter

MaterialsMaterials

The rate at which heat moves The rate at which heat moves depends on the material.depends on the material.

Heat moves faster by conduction in Heat moves faster by conduction in solids and liquids than in gases.solids and liquids than in gases.

In gases, particles are farther apart, In gases, particles are farther apart, so collisions with other particles so collisions with other particles occur less frequently than they do in occur less frequently than they do in solids or liquidssolids or liquids

CopperCopper

The best conductors of heat are metals.The best conductors of heat are metals.

ConvectionConvection

Liquids and gases can flow and are Liquids and gases can flow and are classified as fluids.classified as fluids.

In fluids, thermal energy can be In fluids, thermal energy can be transferred by convection. transferred by convection.

ConvectionConvection is the transfer of is the transfer of thermal energy in a fluid by the thermal energy in a fluid by the movement of warmer and cooler fluid movement of warmer and cooler fluid from place to place.from place to place.

Heat Transfer by Heat Transfer by CurrentsCurrents

Convection currents transfer heat Convection currents transfer heat from warmer to cooler parts of the from warmer to cooler parts of the fluid.fluid.

In a convection current, both In a convection current, both conduction and convection transfer conduction and convection transfer thermal energy.thermal energy.

RadiationRadiation

RadiationRadiation is the transfer of energy is the transfer of energy by electromagnetic waves.by electromagnetic waves.

These waves can travel through These waves can travel through space even when no matter is space even when no matter is present.present.

Energy that is transferred by Energy that is transferred by radiation often is called radiant radiation often is called radiant energy.energy.

Radiant Energy and MatterRadiant Energy and Matter

When radiation When radiation strikes a material, strikes a material, some of the energy some of the energy is absorbed, some is absorbed, some is reflected, and is reflected, and some may be some may be transmitted transmitted through the through the material.material.

Radiant Energy and Radiant Energy and MatterMatter

When radiant energy is absorbed by a When radiant energy is absorbed by a material, the thermal energy of the material, the thermal energy of the material increases.material increases.

Voids.Voids.

The most important feature of The most important feature of electromagnetic waves, is that they electromagnetic waves, is that they require no medium to travel. require no medium to travel.

Energy from the sun is able to travel Energy from the sun is able to travel through space to heat earth. through space to heat earth.