Conductors and Insulators
Heat Transfer 1
Heat Transfer 2
Heat Transfer 3
100
What is the definition of a conductor?
Something that conducts (transfers) heat well
100
Why do hot fluids rise and cool fluids sink?
Hot fluids rise because they become less dense and cool fluids sink because they become denser.
100
Heat moves from the _____ object to the ______ object.
hotter ; cooler
100
Feeling warmth from a campfire.
Radiation
200
Warm clothes prevent you from losing heat through radiation. Are they insulators or conductors?
insulators
200
The transfer of heat energy from the sun to Earth.
Radiation
200
The current of hot magma rising and cool magma sinking is an example of what kind of heat transfer?
Convection
200
Accidently burning your hand on a hot metal pan.
Conduction.
300
Are styrofoam coffee cups insulators or conductors?
Insulators. They don't conduct heat.
300
Do the molecules in a cube of ice move or are they completely still?
They still move a little. Cool things still have heat energy that moves the molecules.
300
What method of heat transfer is this?
Conduction (energy transfer via contact)
300
Radiation is when _____________ waves travel through space, without direct contact.
electromagnetic
400
What is the definition of an insulator? Provide one example of an insulator.
Insulators are materials that impede the free flow of electrons from atom to atom and molecule to molecule.
Examples may vary.
400
What method of energy transfer is this?
(Description: Heat flows from the hotter cup into the cooler hands. )
Conduction (energy transfer via contact)
400
What method of heat transfer is shown in the photo?
It is showing heat radiation
400
Name all modes of heat transfer.
conduction, convection and radiation
500
Explain why a metal spoon feels warmer than a plastic one in the same cup of hot tea. Use the terms insulator and conductor.
The plastic spoon is an insulator, so does not conduct heat from the tea. The metal spoon is a conductor and it will absorb the heat from the tea, making it feel warmer.
500
What method of heat transfer is shown with the arrows in this picture?
Convection heating (hot fluid rises, cool fluid sinks)
500
Describe an example of radiation.
Answers will vary. The warmth we feel from a fire.
500
Which material is best used to keep cold drinks from getting warm too quickly?
a. glass, because i is a good conductor of heat
b. foam, because it is a poor conductor of heat
c. metal, because it radiates heat
d. paper, because it conducts heat
B.
600
Explain one example of a conductor and one example of an insulator you use while cooking.
Answers May Vary.
Examples:
An oven mitt, rubber-coated handles on pans and pots, and rubber and plastic utensils are all examples of insulators. Pots, pans, and metal baking sheets are all examples of conductors.
600
One example of a wave that comes from the Sun is an Ultraviolet (UV) radiation. What type of waves are all waves that come from the sun?
Electromagnetic
600
People sitting around a campfire are able to feel the heat from the fire. How are the people able to feel the heat from the fire without touching the fire? CHOOSE THE BEST ANSWER.
a. The heat from the fire travels through the ground and heats the ground around the people.
b. The heat from the fire is conducted through air molecules to the people.
c. The heat from the fire rises in the air and then settles around the people.
d. The heat from the fire radiates from the fire to the people.
D.
600
Bill stands in a swimming pool and notices that the water around his feet is a lot cooler than the water near the surface. Which process causes this difference in temperature?
a. convection
b. evaporation
c. radiation
d. conduction
A.