Specific Heat Capacity Flashcards
What does specific heat capacity tell us?
How much energy stuff can store.
How are materials different when it comes to specif heat capacity?
It takes more heat energy to increase the temperature of some materials.
Give an example of how different materials heat up?
4200j to warm 1kg of water by 1C.
139j to warm 1kg of mercury by 1C.
Materials which need to gain lots of energy to warm up do what?
Release lots of energy when they cool down again.
‘store’ a lot of heat.
The measure of how much energy a substance can store is called what?
Its specif heat capacity.
What is specific heat capacity?
Its the amount of energy needed to raise the temperature of 1kg of a substance by 1C.
What is water’s specific heat capacity?
4200j/kgc.
What is the formula for specific heat capacity?
E = m x c x Temperature change.
What does the formula stand for?
E - Energy transferred.
M - Mass.
C- Specific heat capacity.
EXAMPLE.
How much energy is needed to heat 2 kg of water from 10C to 100C?
ANSWER.
Energy needed = 2 x 4200 x 90 = 756,000J.
What is the formula triangle for specific heat capacity?
E
m x c x temperature change.
What do heaters have?
High heat capacities to store lots of energy.
What liquid has a really high specific heat capacity?
Water.
Why is water ideal?
Easily pumped around pipes.
Ideal for central heating systems in buildings.
What are electric storage heaters designed to do?
To store heat energy at night and then release it during the day.
