Conduction is the way heat passes through a state. PARTICLES IN A SOLID ARE COMPACT THIS GENERALLY MAKES THEM BETTER CONDUCTORS. When heated, these particles vibrate and pass on the kinetic energy which increases the heat of the object. CHAIN EFFECT
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Why are metals better conductors?
This is because they have free moving electrons. Because the electrons are free to move between the particles in the metal in means the heat transfer rate is more rapid.
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Convection
Convection also involves heat transfer via particles but this involves bulk movement of in liquids or gases and cannot take place in solids.
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How does convection happen
Convection occurs when hotter less dense fluid (gas/liquid) rises and is replaced by cooler more dense fluid moving downwards. This is called a convection current.
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How convection is implemented in day to day life
A heating element is placed at the bottom of a tank of water. This causes the particles around it to heat up and push upwards and this causes it to replace the other particles and they go round in a cycle. This happens in heaters or radiators!
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Radiation
Heat radiation is emitted by all materials, gases, liquids or solids and the hotter the material the more strongly it gives out heat radiation which is called infrared radiation
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specific heat capacities
The heat specific heat capacity in simple terms is how much energy (J) is needed to heat a specific mass (1 kg) by one degree oC.
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evaluation of specific heat capacities in materials
Examples to be studied include the use of water, which has a very high specific heat capacity, oil-filled radiators and electric storage heaters containing concrete or bricks.
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Other cards in this set
Card 2
Front
This is because they have free moving electrons. Because the electrons are free to move between the particles in the metal in means the heat transfer rate is more rapid.
Back
Why are metals better conductors?
Card 3
Front
Convection also involves heat transfer via particles but this involves bulk movement of in liquids or gases and cannot take place in solids.
Back
Card 4
Front
Convection occurs when hotter less dense fluid (gas/liquid) rises and is replaced by cooler more dense fluid moving downwards. This is called a convection current.
Back
Card 5
Front
A heating element is placed at the bottom of a tank of water. This causes the particles around it to heat up and push upwards and this causes it to replace the other particles and they go round in a cycle. This happens in heaters or radiators!
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