811979
Description
Flashcards by Chloe Roberts, updated more than 1 year ago
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Created by Chloe Roberts
over 11 years ago
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| Question | Answer |
| What do all object emit? | Infra-red radiation |
| Dark, matt surfaces are good ...? | Absorbers and emitters of radiation |
| What are shiny silver surfaces good for? | Being reflectors of radiation. |
| Does a object have to be hot or cold to increase the more infra-red radiation it emits? | Hot |
| What does infra-red radiation travel in? | Waves |
| What do we see infra-red radiation on? | Thermograms |
| What is evapouration | when a liquid turns into a gas |
| What is condensation? | When a gas turns into a liquid |
| What effect does evaporation have? | Cooling effect - faster moving molecules escape from the liquid |
| What is conduction? | Heat transfer in a solid |
| How do particles transfer heat? | Vibrate |
| What is convection? | Heat transfer in liquids and gases |
| Why are metals good at conducting heat? | Because they have free electrons |
| What happens when a fluid is heated? | The particles expand making it less dense so it rises |
| Why does convection in fluids occur? | Due to changes in density |
| What is a u-value? | a measure of how effective a material is as an insulator |
| How can you tell by a u-value if a product is good at insulating? | The lower the u-value the better |
| What is the payback time? | the time it takes to save back the installation cost. It tells us how cost-effective it is. |
| What do solar panels do? | heat up water |
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