편미분 관계식 관련 문제
질문
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풀이
편미분 관계식을 활용한 문제입니다.
[열역학 Thermodynamics/12. 일반관계식 Thermodynamic Relations ] - 편미분 관계식 partial differential relations
\[du = \left( \frac{\partial u}{\partial v}\right)_{T}dv+ \left(\frac{\partial u}{\partial T} \right)_{v}dT \]
\[dv = \left( \frac{\partial v}{\partial T} \right)_{P}dT + \left( \frac{\partial v}{\partial P}\right)_{T}dP \]
\[du = \left( \frac{\partial u}{\partial v}\right)_{T}\left[ \left( \frac{\partial v}{\partial T} \right)_{P}dT + \left( \frac{\partial v}{\partial P}\right)_{T}dP \right]+ \left(\frac{\partial u}{\partial T} \right)_{v}dT \]
\[= \left[\left( \frac{\partial u}{\partial v}\right)_{T}\left(\frac{\partial v}{\partial T}\right)_{P}+\left(\frac{\partial u}{\partial T} \right)_{v} \right]dT+ \left( \frac{\partial v}{\partial P}\right)_{T}\left( \frac{\partial u}{\partial v}\right)_{T}dP\]
\[du= \left(\frac{\partial u}{\partial T} \right)_{P}dT + \left( \frac{\partial u}{\partial P}\right)_{T}dP \]
\[ \therefore \left( \frac{\partial u}{\partial v}\right)_{T}\left(\frac{\partial v}{\partial T}\right)_{P}+\left(\frac{\partial u}{\partial T} \right)_{v} =\left(\frac{\partial u}{\partial T} \right)_{P}\]
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