1. Heat Transfer EQ: What are the three forms of Heat Transfer?

2. Conduction Convection Radiation 3 Ways Energy (Heat) is Transferred
Warm up 2/1 Do this!!
Use a whole page and copy the organizer
3 Ways Energy (Heat) is Transferred
Conduction
Convection
Radiation

3. How is Heat Transferred?
There are THREE ways heat can move.
Conduction
Convection
Radiation

4. CONDUCTION Conduction = CONTACT Mainly happens in solids
Heat is transferred from one particle of matter to another in an object without the movement of the object.
Conduction = CONTACT
Mainly happens in solids

5. Have you ever…
Touched a metal spoon sitting in a pan of boiling water only to be surprised by HOW hot it is??
Think back to what you know about metals and nonmetals. What conducts heat better, metal or nonmetal? Why?

6. Example of Conduction
Think of a metal spoon in a pot of water being heated.
The fast-moving particles of the fire collide with the slow-moving particles of the cool pot.
Because of these collisions, the slower particles move faster and heat is transferred.
Then the particles of the pot collide with the particles in the water, which collide with the particles at one end of the spoon.
As the particles move faster, the metal spoon gets hotter. This process of conduction is repeated all along the metal until the entire spoon is hot.
Have an example sitting in front on the lab table (doesn’t need to be on); a visual.

7. EXAMPLE OF CONDUCTION Add to your organizer
A piece of cheese melts as heat is transferred from the meat to the cheese (Contact)

8. CONVECTION
Convection is the movement that transfers heat within fluids (liquids and gases) and air (gas).
Heat is transferred by currents within the fluid or gas
Convection currents = VENTS (through air and liquid particles)
Convection moves in
a circular pattern

9. Examples of Convection:
Have you ever noticed that the air near the ceiling is warmer than the air near the floor? Or that water in a pool is cooler at the deep end?
Examples: air movement in a home, pot of heating water.
Pick one of these examples and draw the circular pattern in your notes.
When the water at the bottom of a pot is heated, its particles move faster, and they also move farther apart. As a result, the heated water becomes less dense. A less dense fluid will float on top of a more dense one. Therefore, the heated water rises in the pot. The surrounding cooler water flows into its place.
This flow creates the circular motion as seen on the next page, which is known as convection currents.

10. RADIATION Radiation is the transfer of energy by electromagnetic waves
Radiation does NOT require matter to transfer thermal energy
Radiation = Radiates (heat escaping the sun)

11. Radiation May Come From Other Sources
Have you ever sat too close to a campfire while cooking marshmallows? You’re enjoying the warmth ….. only to notice that your skin is really warm?

12. Examples of RADIATION
Fire
Heat Lamps
Sun

13. Heat and Thermal Energy
Heat is thermal energy that is transferred from one
object to another object at a different temperature.
Heat always moves from warmer to cooler objects!
Heat moves from a higher temperature to objects at a lower temperature.

14. 3 Ways Energy (Heat) is Transferred
*Transfer of heat (energy) that happens when molecules bump into each other
*Objects must be touching
*”Conduction is touchin’”
*Transfer of heat by the flow of material
*In warm air, the molecules move apart, so it is less dense and rises
*In cooler air, the molecules move closer together, so it is more dense and sinks
*Transferred in rays or waves
*Energy from the Sun warms the Earth
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