Tuesday Oct. 25 th P.S.-Compare and contrast active solar heating and passive solar heating. Bio-...

Tuesday Oct. 25th

P.S.-Compare and contrast active solar heating and passive solar heating.

Bio- Compare and contrast autotrophs and heterotrophs.

Thermal Energy on the MoveThermal Energy on the Move

Thermal energy travels as heat Thermal energy travels as heat from higher temperature to low from higher temperature to low temperature.temperature.

3 Ways Thermal Energy can 3 Ways Thermal Energy can movemove

1.1. ConductionConduction

2.2. ConvectionConvection

3.3. RadiationRadiation

1.1. Conduction-Conduction- the transfer of the transfer of energy through matter by energy through matter by direct contact of particles.direct contact of particles.

Ex: Spoon in a pot of boiling water. The heat from the stove heats the pot which heats the water which heats the spoon.

What are some other examples of conduction?

2. Convection-2. Convection- the transfer of the transfer of energy by the bulk movement energy by the bulk movement of matter.of matter.

Hot water rises

Cooler water sinks

Cools at the surface

-This happens when fluid particles move from 1 location to another, carrying energy with them.Ex: hot-air balloon

What are some other examples of convection?

Radiation-Radiation- the transfer of the transfer of energy in the form of waves.energy in the form of waves.

-Does not require matter.-Does not require matter.

There are no particles between the Sun and the Earth.

? RADIATION

Ex: Sun-rays

-Only radiant energy that is absorbed changes to thermal energy (heat).

What are some other examples of radiation?

Questions to think about1. What are some pros and cons about conduction?2. What are some pros and cons about convection?3. What are some pros and cons about radiation?4. Rank the type of heat transfer from most important to least important. Why??

Label the heat movement as conduction, convection or radiation.

1.Lava Lamp 2.Fire 3.Spoon in soup

Convection Radiation Conduction

Exit Ticket Answer the following questions on a separate sheet of paper.

1. What type of heat transfer is a radiometer?2. Write a paragraph comparing and contrasting conduction, convection and radiation.

Promoting Thermal EnergyPromoting Thermal Energy

Conductors-Conductors- allow heat to allow heat to move easily through them.move easily through them.

Ex: MetalsEx: Metals

Solids Solids

Reducing Thermal EnergyReducing Thermal Energy

Insulators-Insulators- do not allow heat do not allow heat to move easily through them.to move easily through them.

Ex: WoodEx: Wood

PlasticPlastic

GlassGlass

GasGas