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a) U-values measure how effective a material is as an insulator. |
Knowledge of the U-values of specific materials is not required, nor is the equation that defines a U-value. |
Mathematically minded students will prefer to be given the equation and have it explained - this will help them remember whether a U-value needs to be high or low. |
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The specific heat capacity of a substance is the amount of energy required to change the temperature of one kilogram of the substance by one degree Celsius.
E = m x θ x c
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E is energy transferred in joules, J
m is mass in kilograms, kg
θ is temperature change in degrees Celsius, °C
c is specific heat capacity in J / kg °C |
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