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Specific Latent Heat - Coggle Diagram
Specific Latent Heat
Practical
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Method
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Connect the heater to the power supply and joulemeter, turn it on and record the temperature every 20 seconds.
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As there are two boundaries, solid/liquid and liquid/gas, each material has two specific latent heats:
latent heat of fusion ‐ the amount of energy needed to freeze or melt the material at its melting point
latent heat of vaporisation ‐ the amount of energy needed to evaporate or condense the material at its boiling point
Measuring Latent Heat
Latent heat can be measured from a heating or cooling curve line graph. If a heater of known power is used, such as a 60 W immersion heater that provides 60 J/s, the temperature of a known mass of ice can be monitored each second.
The graph is horizontal at two places. These are the places where the energy is not being used to increase the speed of the particles, increasing temperature, but is being used to break the bonds between the particles to change the state.
The longer the horizontal line, the more energy has been used to cause the change of state. The amount of energy represented by these horizontal lines is equal to the latent heat.
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