15127985
Description
Flashcards by Thalia Grace, updated more than 1 year ago
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Created by Thalia Grace
about 6 years ago
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| Question | Answer |
| Conduction - transfer of heat in solids - high temperature => low temperature - flow stops when temperature is equal | Particle model of conduction - particles move closer to heat source => vibration - particles bump into those next to them and transfer energy - as this continues to happen heat energy spreads through the substance |
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Good conductors of heat - things that conduct well are called 'good conductors' most metals are good conductors eg. copper, iron, aluminium - they are good thermal conductors- that's why we use them as cooking utensils |
| Convection - method of heat transfer in gas or liquid - requires substances that flow - cannot happen in solids | Particle model of convection - hot liquids and gases rise when heated - as particles gain energy the expand - causes the substance to get less dense - eg: when boiling water, water is heated and becomes steam, and the steam rises. |
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Movement of gas or fluid by convection is also known as 'convection current'
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Example
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| Radiation - all objects emit heat through infra-red radiation - the more heat an object contains, the more infra- red radiation it gives off - the sun's heat reaches the earth through radiation | Particle model of radiation - no particles are involved in heat radiation - which is why it works in space - this type of heat transfer does not require any medium |
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Objects : Absorption
- dark surfaces absorb more heat than light surfaces
- shiny surfaces reflect more heat than dull surfaces.
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