Specific heat capacity Flashcards
What do some materials need more of than others?
Heat energy to increase the temperatures of them.
What do materials which need to gain lots of energy to warm up do?
They also release lots of energy when they cool down again.
What can materials which need to gain lots of energy to warm up do?
Store a lot of heat.
What is a substances specific heat capacity?
The measure of how much energy a substance can store.
What is specific heat capacity?
The amount of energy needed to raise the temperature of 1kg of a substance by 1’c.
What is waters specific heat capacity?
4200 J/kg’c.
What is the equation to work out the energy transferred in joules?
E = m x c x Θ
E = energy transferred (J)
m = mass (kg)
c = specific heat capacity (J/kg'c)
Θ = temperature change ('c)
What is the formula triangle in case you need to rearrange the equation?
m x c x Θ
What do the materials used in heaters usually have?
High specific heat capacities.
Why do the materials used in heaters usually have higher specific heat capacities?
So that they can store large amounts of heat energy.
What does waters high specific heat capacity mean?
As it’s a liquid it can easily be pumped around in pipes, ideal for central heating systems in buildings.
What are electric storage heaters designed to do?
Store heat energy at night (when electricity is cheaper), and then release it during the day.
How do electric storage heaters store heat?
Using concrete or bricks which have a high specific heat capacity (around 880 J/kg’c).
What are some heaters filled with instead of water?
Oil.
Why are oil heating systems not as good as water-based systems?
Because oil has a lower specific heat capacity than water.
