Warm fluid becomes less dense and rises which is then replaced by cooler, denser fluid
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What is convection?
Convection is the circulation of a fluid (liquid or gas) caused by heating it
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What is evaporation?
Evaporation is when a liquid turns in to a gas
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What is condensation?
Condensation is when a gas turns in to a liquid
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What can increase the rate of condensation?
Increased surface area or reducing surface temperature
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What can increase the rate of evaporation?
Increased surface area of liquid, increased temperature of the liquid, creating a draught of air across the liquid's surface
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The rate of energy transfer to or from an object depends on what 3 things?
the shape size and type of material, materials which are in contact with the object, the temperature difference between the object and its surroundings
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Three ways to maximise the rate of energy transfer to keep things cool?
Use things that are: good conductors, painted dull black, have maximum air flow around them
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Three ways to minimise the rate of energy transfer to keep things warm?
Use things that are: good insulators, white and shiny, prevent convection currents by trapping air in small pockets
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What is specific heat capacity?
Specific heat capacity of a substance is the amount of heat required to raise the temperature of 1kg of the substance by 1 degree celcius
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If an object has a greater mass, will its temperate increase faster or slower?
Slower
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What is the formula for specific heat capacity?
E = m x c x temp change
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How can you reduce the rate of energy transfer in our homes?
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