Thermal physics

• Created by: argyrou
• Created on: 08-05-18 13:43
What are the 2 possible reasons why internal energy would be constant?
-no energy transfer by heating so no work is done - energy transfer by heating and work done balance each other out
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Define thermal equilibrium
When 2 objects are at the same temperature so there is no change in internal energy
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How would you work out temperature in Kelvin if given temperature in degrees?
Temp in K= Temp in C + 273
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What is absolute zero kelvin?
the lowest possible temperature where an object at this temp would have minimum internal energy where volume and pressue is zero
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Define specific heat capacity C
energy needed to raise the temperature of unit mass of the substance by 1K without change of state
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What is the equation for energy transferred when its temperature changes?
_ Q=mC_ T
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What is the equation for specific heat capacity used in the inversion tube experiment?
C=gLN/_ T
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what is the equation to find electrical energy supplied by a heater to heat a metal?
E=ItV
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Assuming no heat is lost to the surroundings, what equation would you use to find specific heat capacity using electrical methods?
C=ItV/m_ T
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Define specific latent heat of fusion
Energy needed to change the state unit mass of the substance from solid to liquid without changing temperature
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Define specific latent heat of vaporisation
energy needed to change the state of unit mass of the substance from liquid to vapour without change of temperature
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Define sublimation
process of solids vaporising directly when heated
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What equation would you use to calculate energy transferred when its state changes?
Q=mL
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What is the equation for power at a change in state point?
p=mL/t
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Other cards in this set

Card 2

Front

Define thermal equilibrium

Back

When 2 objects are at the same temperature so there is no change in internal energy

Card 3

Front

How would you work out temperature in Kelvin if given temperature in degrees?

Card 4

Front

What is absolute zero kelvin?

Card 5

Front

Define specific heat capacity C