A2 Physics Thermodynamics
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5 Terms
1
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what is internal energy
the sum of kinetic energy and potential energy of random motion of molecules in a system
2
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what does a change in temperature do to internal energy
an increase in temperature increases the kinetic energy of a system and therefore increases the internal energy
3
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formula for work done on the gas
W = p Δ V
4
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sign differences in work done on gas
work done on gas: compressed (+W)
work done by gas: expands (-W)
5
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formula for first law of thermodynamics
ΔU = q + W ; ΔU is change in internal energy, q is heating of the system, and W is work done on the gas
Note 
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