Thermal Thermal Energy Energy

Transfer NotesTransfer Notes

21 JAN 1521 JAN 15

Starter: Iced SodaAfter coming inside on a summer day, Trina poured her friends, Jack and Darlene, a glass of soda. The soda was warm, so Trina added some ice to the soda in the glasses. After several minutes, Trina and her friends noticed that the soda was cold, but the ice was gone. Trina asked Jack and Darlene what they thought made the soda get cold. Which idea do you think best explains how the soda became cold?

Trina said, “I think the heat moved from the soda to the ice.”Jack said, “I think the cold from the ice moved to the soda and the heat from the soda moved to the ice, so it was a two way move!”Darlene said, “I think the cold from the ice moved to the soda to make it cold.”

Starter : I agree with______ because

_________________________.

Substances Substances are made of are made of

small small particles particles ((atomsatoms))

which are in which are in constant constant motion.motion.

The total energy The total energy of the particles in of the particles in

a substance is a substance is calledcalled thermal thermal

energy energy

+ =

Thermal energy is Thermal energy is a form ofa form of kinetic kinetic

energyenergy..

Why do you think it Why do you think it is a form of kinetic is a form of kinetic

energy?energy?

HINT:HINT:

As the particles in As the particles in a substance a substance

move move fasterfaster the the amount of amount of

energy increases energy increases and so does the and so does the temperature.temperature.

The amount of The amount of thermal energy thermal energy is is measuredmeasured

with a with a thermometer.thermometer.

Thermal Thermal energy can be energy can be transferredtransferred from place to from place to place.place.

We can We can predictpredict which way the which way the energy will energy will move. move.

Thermal energy Thermal energy moves from the moves from the greatest greatest amount amount of energy of energy (warmest) to the (warmest) to the lowestlowest energy energy (coolest).(coolest).

The energy will continue The energy will continue to move until it reaches to move until it reaches

equilibriumequilibrium. .

Energy Movement

This means both objects This means both objects will have the will have the same same

amountamount of energy or of energy or temperaturetemperature..

Energy Movement

Which way does the Which way does the thermal energy thermal energy move?move?

The The thermal thermal energy energy moves moves

from warm from warm to cool.to cool.

There are There are threethree ways ways thermal thermal energy energy can be can be transferretransferred.d.

ConductiConductiononConvectioConvectionnRadiationRadiation

ConductioConduction…n…

Thermal energy transfers when two objects or particles touch.

ConvectioConvection…n…

In gases and liquids (fluids), thermal energy is transferred through the fluid by convection.

The fluid The fluid circulates in a in a manner such manner such that the that the warmerwarmer material material risesrises and the and the coolercooler material sinks. material sinks.

Radiation…Radiation…

Thermal energy can be transferred through empty space.

This method of This method of heat transfer heat transfer occurs in occurs in spacespace, the , the atmosphereatmosphere, , and from and from lightlight..

Examples of Radiation Examples of Radiation

Convection, Conduction and

Radiation

Convection, Conduction Convection, Conduction and Radiation and Radiation

Application:Decide if the description is convection, radiation, or conduction

1.hot water rises and

cold water sinks2. stir frying

vegetables3. a spoon in a cup of

hot soup becomes warmer

Connection: Ice Cube Connection: Ice Cube RaceRace

Each group will have a 100 ml ice cube Each group will have a 100 ml ice cube baggiebaggie

You will have 5 minutes to transfer as much You will have 5 minutes to transfer as much energy as you can to your ice cube (to melt energy as you can to your ice cube (to melt it).it).

You can use conduction, convection or You can use conduction, convection or radiation on your ice but the bag must radiation on your ice but the bag must remained sealed.remained sealed.

At the end of 5 minutes, measure the amount At the end of 5 minutes, measure the amount of water formed, using a graduated cylinder.of water formed, using a graduated cylinder.

Connection and Exit:Connection and Exit:

1.1. How much water did you have at How much water did you have at the end of 5 minutes?the end of 5 minutes?

2.2. What did you do to your baggie to What did you do to your baggie to help melt the ice?help melt the ice?

3.3. If you could repeat the experiment, If you could repeat the experiment, what would you like to try this time?what would you like to try this time?