level: conduction and stuff
Questions and Answers List
level questions: conduction and stuff
| Question | Answer |
|---|---|
| what are good conductors and why | metals, becuase of delocalised electrons |
| what is the process of conduction | when heat is applied, the positive metal ions start vibrating and gain kinetic energy, transfered to cool parts of metal by the delocalised electrons |
| what are insulators | poor conductors - plastic, wood (because no delocalised electrons), air (extermely far particles) |
| when is convection happens | liquids and gases |
| what is process of convections | for example, a radiator will heat up the air above the radiator to gain kinetic energy, air expands so the particles occupy more space so the particles become less dense so they rise, where they become cooler so they sink and goes back to radiator, cools down. |
| where can radiation travel | solids, liquids and gases |
| what colour reflects infared radiation | white |
| what colour absorbs infared radiation | black |
| how does heat transfer occur in a vacuum (a space with no particles) | radiation |