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Cards In This Set
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Expansion is when..
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An object absorbs heat. It increases in size (due to the increased space between particles. Thus, vol increasing and density decreasing.)
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Contraction is when..
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An object loses heat. It decreases in size (due to the small spacing of particles. This causes volume to decrease and density to increase.)
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Hotness and Coldness is measured by and uses
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The object's temperature and uses thermometer
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Common unit for temperature is
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Celcius (°c)
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SI unit for temperature
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Kelvin (K)
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0K
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Lowest temperature anywhere
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Ball and Ring
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When Ball is cold it will pass through ring easily. When Ball is hot, the increase of volume will prevent it from passing through the ring.
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Formula for Mass, Density, and Volume
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 Mass: Density x VolumeDensity: Mass/VolumeVolume: Mass/Density |
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When object increases or decreases
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Volume and Density will be changed whilst Mass will stay the same.
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Bimetallic Strip is
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Two metals joined together. One metal is more dominant (expands/contracts more) than the other. This uneven contraction/expansion causes strip to bend. It is connected to a Circuit.
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How does Bimetallic Strip work?
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Bimetallic strip will expand/contract and bend away from contact point, making the circuit an open circuit and this will switch off the circuit due to the disruption of current flow. However, once temperature rises/lowers the strip will return to its former state and touches the contact point once more which creates a closed circuit, meaning current will be able to flow through once more.
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Real-life Example for Bimetallic Strip
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Fire Alarm, Refrigerator
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Conduction
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No obvious movement of the medium Transfers through contact
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Convection
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Transfers heat with obvious movementOnly for liquid and gasMovement of substance itself causes heat transferHot rises and cool sinks (convection current)
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Radiation
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No need for a medium.Uses energy waves No need of contact unlike conductionNo need of current unlike convection
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