specific heat capacity

• What should you be able to calculate by the end of the video?

  The amount of energy stored in or released from a system as its temperature changes
• What is specific heat capacity?

  It is the amount of energy required to raise the temperature of 1 kg of a substance by 1° C
• What is the specific heat capacity of water?

  4,200 J per kilogram per °C
• How do you calculate the change in thermal energy?

  • Use the equation:

  $\Delta E =$$m \cdot c \cdot \Delta T$

  • Where:
  • $\Delta E$ = change in thermal energy (Joules)
  • $m$ = mass (kg)
  • $c$ = specific heat capacity (J/kg°C)
  • $\Delta T$ = temperature change (°C)
• Calculate the energy required to increase the temperature of 2 kg of water from 20° C to 100° C.

  The energy required is 67,200 J
• How do you convert Joules to kilojoules?

  By dividing the number of Joules by 1,000
• What is the thermal energy stored in a 1.5 kg aluminium plate when the temperature rises from 20° C to 200° C?

  The thermal energy stored is 246,510 J
• What is the specific heat capacity of aluminium?

  913 J per kilogram per °C
• How much thermal energy does a hot water bottle release when cooling from 80° C to 20° C?

  76,000 J
• How do you rearrange the equation to find the mass of water in the hot water bottle?

  Rearrange to $m =$$\frac{\Delta E}{c \cdot \Delta T}$
• What is the mass of water in the hot water bottle if it releases 76,000 J of thermal energy?

  The mass is 3 kg
• What is the process to calculate thermal energy changes in a system?

  1. Identify the mass of the substance.
  2. Determine the specific heat capacity.
  3. Calculate the temperature change.
  4. Use the equation:

  $\Delta E =$$m \cdot c \cdot \Delta T$

  1. Solve for the desired variable.