14 lines
630 B
Markdown
14 lines
630 B
Markdown
[[Thermodynamics]]
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# Summary
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* First law: $\Delta U=Q+W$
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* Q is heat added W is work done
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* Internal energy $U$ is the sum of kinetic energy and potential energy. Ideal gas has no internal potential energy, so solely kinetic.
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* Ideal monatomic gas has formula: $U=\frac{3}{2}Nk_BT=\frac{3}{2}nRT$
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* Work done on gas by external pressure: $W=-P\Delta V$
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* Negative sign means expansion does negative work on gas.
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* On a PV graph, integrals are work done, and straight lines are isotherms.
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* Four special processes:
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* Isovolumeric $W = 0$
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* Isothermic $\Delta U = 0$ For an ideal gas
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* Isobaric $W=-P\Delta V$
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* Adiabatic $Q=0$ |