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Specific Heat Capacity


Mind Map on Specific Heat Capacity, created by anndjan21 on 03/08/2014.
Mind Map by anndjan21, updated more than 1 year ago
Created by anndjan21 over 8 years ago

Resource summary

Specific Heat Capacity
  1. Basics
    1. Materials which need to gain lots of energy to warm up also release lots of energy when cooling down – ‘store’ lots of heat.
      1. When substance is heated, temp depends on:
        1. Amount of energy supplied to it
          1. Mass of substance
            1. What substance is
            2. Specific heat capacity of a substance: energy needed/transferred to 1kg of substance needed to raise its temp by 1°C.
              1. Unit for specific heat capacity is joules per kg per °C.
              2. Formula: E = m x c x θ
                1. Where E = energy transferred in J
                  1. m = mass in kg
                    1. c = specific heat capacity in J/kg °C
                      1. θ = temp change in °C.
                        1. To find specific heat capacity – rearrange equation: c = E/m x θ
                      2. Storage Heaters
                        1. Materials used in them usually have high specific heat capacities to store lots of energy.
                          1. Water has high specific heat capacity + is liquid so can be pumped in pipes – ideal for central heating.
                            1. Uses electricity at night (off-peak) to heat special bricks/concrete blocks in heater. Energy transfer from bricks keeps room warm – have high specific heat capacity - store lots of energy. Warm up slowly when heater element is on + cools slowly when off.
                              1. Some are filled with oil which has specific heat capacity that’s lower than water – often not as good as water -based systems.
                                1. However oil does have higher boiling point – oil filled heaters can safely reach higher temps than water-based ones.
                                2. Electricity consumed at off-peak times sometimes charged at cheaper rate – storage heaters designed to be effective.
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