GCSE Physics (AQA)

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Calculating Change in Temperature

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Particle model of matter Internal energy and energy transfers

Calculating Change in Temperature

3:18 Heating to Change Temperature
Spec 4.1.1.1 4.1.1.3 4.3.2.2
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  • The energy change required for a temperature change in a substance depends on its mass and specific heat capacity.
  • Specific heat capacity is defined as the amount of heat needed to raise the temperature of one kilogram of a substance by one degree Celsius.
  • The formula for change in thermal energy is: ��E = m �� c �� ��T, where ��E is the change in energy, m is mass, c is specific heat capacity, and ��T is the change in temperature.
  • Energy is measured in joules, mass in kilograms, and temperature change in degrees Celsius.
  • Specific heat capacity is calculated as joules per kilogram per degree Celsius.
  • Example given: 18 kilojoules of heat supplied to a 2 kg block of steel with a specific heat capacity of 450 joules/kg��C, initially at 18��C.
  • To find the final temperature, convert the given energy from kilojoules to joules (18,000 joules).
  • Rearrange the specific heat capacity formula to solve for the change in temperature: ��T = ��E / (m �� c).
  • Substitute values into the rearranged formula to calculate the change in temperature, resulting in a 20��C increase.
  • Calculate the final temperature by adding the change in temperature to the initial temperature, resulting in a final temperature of 38��C for the steel block.

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