Specific Heat
▪ Have you ever jumped into a swimming pool on a hot day and found the water to be cold?
← Even though the H2O has absorbed a lot of
heat, the temperature of the H2O has a cooler temperature than the air. Why?
❑ Different materials need different amounts of heat to produce similar changes in their temperatures.
❑ They have different specific heats.
Specific heat ( Amount of energy it take to raise the temperature of 1kg of the material 1oC or 1oK
We’ll use (Really same thing)
Symbol (C)
Using C
❑ Suppose that you take a 3.1g ball of aluminum foil from a pot of water that was 30oC (The Al ball was also 30oC). You then allow the ball to cool to 15oC (Room temperature). You have a change in thermal energy. The change can be calculated.
Change in Thermal Energy = Mass x Change in temp. x Specific heat
Formula
Q = m x ΔT x C
Δ means change in
ΔT = TFinal – TInitial
- When ΔT is (+), object has gained heat
- When ΔT is (-), object has given off heat
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