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10 Cards in this Set
- Front
- Back
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Heat is a form of energy |
Unit of measurement = joule ( J ) |
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What energy conversion takes place when you light a fire? |
Chemical energy (coal) -> light and heat energy |
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Give an example of heat causing an object to expand |
Feet swell when walking for a long time Telephone wires loop down in summer Bridges have rollers to allow for expansion Mercury/alcohol expands in a thermometer |
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What is the principal of a thermometer? |
Liquids expand when heated and contract when cooled |
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What experiment shows that solids expand when heated and contract when cooled? |
The ball and ring exp. @ Room temp- ball just about fits through ring When heated- ball doesn't fit When cooled - ball easily fits |
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What experiment shows that liquids expand when heated and contract when cooled? |
Flask with stopper and tube filled with water in a water bath Mark water level on tube at room temp Put in warm water bath Mark new temp Take out and cool Mark new temp |
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What experiment shows that gases expand when heated and contract when cooled? |
Flask with tube and stopper filled with air. Tube put in waterHeat air with hands air. Tube put in water Bubbles show expansion of the air Let cool Water rushes up tube to fill in for lost air |
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Why is water not a good liquid to use for a heat experiment? |
Because when water reaches 4°C it expands when cooled and contracts when heated Which is why fish can survive in frozen over lakes |
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What is the definition of conduction? |
Conduction is the method by which heat travels from particle to particle through a solid e.g. along a metal spoon |
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What is the definition of convection? |
Convection is the transfer of heat through a liquid or gas when the particles of the liquid or gas move and carry the heat with them |
