HeatHeat

CH 4 Prentice Hallp.115-117

CH 4 Prentice Hallp.115-117

TransferTransfer

• Heat is the energy transferred from a hotter object to a colder object. – The hotter something is, the faster its molecules

are moving.– Does ice have heat?

Heat

• Three ways heat is transferred- – Convection– Conduction– Radiation

Heat Transfer

• Write down your observations of the spiral demonstration. What is happening and why?

Spiral Demo

• Using an arrow, predict the location of the flame where I would be able to light the match without touching the flame its self.– Top– Middle– Bottom

• Observe this last demo and think about why this happened.

Candle Demo

• At stations 2 and 3 you must wear safety goggles.

• You are working with hot objects, please keep your hands and other flammable materials away from the candle and hot plate.

Safety

• Each station is numbered (1, 2, or 3). You will begin at the station where you are currently sitting. You will have 4 minutes at each station to draw a picture, and record written observations for each example of heat transfer.

• At the end of 4 minutes, you will hear the song, I Like to Move It, move to the next station.– Ex. If your at station 2, move to station 3 next,

and finally to station 1

Heat Transfer Stations

Remaining Time:

Remaining Time:

Remaining Time:

Remaining Time:

Remaining Time:

Remaining Time:

• Open your book to page 115.

– Read about the three types of heat transfer.– Decide which station represented each type of

heat transfer and copy the notes and examples.

ClimateNext Step

• The transfer of energy over long distances of space.

• Moves in waves.• No direct contact– Sunlight– Open fire

ClimateRadiation

• Heat transfer by direct contact of particles of matter.

• Particles bump into each other and transfer their energy heating them up.– Putting your hand on a hot stove.

Conduction

• Heat transfer by the circular movement of a fluid (liquids and gasses).

• Particles flow transferring heat energy.• Caused by differences in density.

Convection

• Density: the amount of mass in a given volume. D=M/V

• Heated Fluids:– Move faster and bump into other particles.– They spread out increasing the volume.– Density decreases

• Cooling Fluids– Move slower– They come together decreasing the volume.– Density increases

How Convection Works

Convection Lab

Convection and Sea

The Ocean Floor

The Ocean Floor