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Heat Transfer
| Term | Definition |
|---|---|
| What are the 3 methods of heat transfer? | conduction, convection, radiation |
| What is conduction? | heat transfer through a substance from direct contact whend there is a temperature difference |
| Fact about molecules | "The molecules in the warmer object vibrator faster than the ones in the cooler object." |
| What happens when faster-vibrating molecules and cooler molecules collide? | The cooler molecules vibrate faster, making the cooler object wamer. |
| How is conduction mainly received? | by touching hot objects |
| What is convection? | heat transfer by movement of a heated liquid: the hotter portions rise and the colder sink. |
| When does convection happen? | when particles with more thermal energy in a liquid or gas replace particles with less thermal energy. |
| What are 4 convection examples? | boiling water, ice melting, ocean currents, hot air ballons |
| What is radiation? | energy that is transported through space by electromagnetic waves. |
| Radiation transfers energy without a medium because... | electromagnetic waves carry heat. |
| In contrast to conduction, ... are not transmitted by the vibration of particles | electromagnetic waves |
| What are the 2 characteristics of everything in the electromagnetic spectrum? | they're radiation they do not require a medium to travel & transfer energy |
| How does heat transfer by radiation differ from conduction and convection? | Heat transfer by radiation does not involve particles. |
| What is a conductor? | A conductor is a material or device that conducts or transmits heat, or easily allows electrical charge to move through it. |
| Name 5 materials that are good condutors. | metal, aluminum, copper, gold, silver |
| What do these materials contain? | free electrons that collide with their atoms and transfer heat. |
| What is increased when there are more free electrons? | conductivity |
| What is an insulator? | a material or an object that slows energy transfer and the easy passage of heat, electricity, light, or sound |
| Name 3 materials that are good insulators. | Fiberglass, mineral wool, natural fibers |
| Why are these materials good insulators? | their open structure absorbs amount of air to regulate heat |
| What makes a material a good conductor? | if it allows electron circulation and increases heat transfer |
| What makes a material a good insulators? | if its atoms have "tightly bound electrons." electrons do not collide with neighboring atoms. decreases heat transfer |
Created by:
Beia Aria
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