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1 Work and Heat 功與熱. 2 功 dW = F × dL W = F ×  LdW = F × dL W = F ×  L 對於汽缸與活塞組合之裝置 對於汽缸與活塞組合之裝置 P = F / A ; F = PAP = F / A ; F = PA dW = PA × dL =

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Presentation on theme: "1 Work and Heat 功與熱. 2 功 dW = F × dL W = F ×  LdW = F × dL W = F ×  L 對於汽缸與活塞組合之裝置 對於汽缸與活塞組合之裝置 P = F / A ; F = PAP = F / A ; F = PA dW = PA × dL ="— Presentation transcript:

1 1 Work and Heat 功與熱

2 2 功 dW = F × dL W = F ×  LdW = F × dL W = F ×  L 對於汽缸與活塞組合之裝置 對於汽缸與活塞組合之裝置 P = F / A ; F = PAP = F / A ; F = PA dW = PA × dL = P × dV if P  f(V), then W = P ×  VdW = PA × dL = P × dV if P  f(V), then W = P ×  V

3 3 熱 Joule’s ExperimentsJoule’s Experiments James P. Joule (1818 – 1889)James P. Joule (1818 – 1889)

4 4 熱力學第一定律 for non-nuclear reaction process  E = 0 ;  E system +  E surr. = 0for non-nuclear reaction process  E = 0 ;  E system +  E surr. = 0  (U +KE+PE) = W + Q  (U +KE+PE) = W + Q  U = W + Q  U = W + Q

5 5 功與熱的角色 for non-nuclear reaction process  E = 0 ;  E system +  E surr. = 0for non-nuclear reaction process  E = 0 ;  E system +  E surr. = 0  E system =  (U +KE+PE)  E system =  (U +KE+PE)  E surr. 由 W 與 Q 替代其角色  E surr. 由 W 與 Q 替代其角色

6 6 熱力學第一定律  (U +KE+PE) = W + Q  (U +KE+PE) = W + Q 對於大部分之密閉系統的科學觀察  U = W + Q 對於大部分之密閉系統的科學觀察  U = W + Q

7 7 功 流動程序的功之種類 流動程序的功之種類 軸功 軸功 流體流動功 流體流動功 壓容功 壓容功


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