5. 推導相對濕度與百分濕度之關係式，並說明不同條件下之兩者大小比較 (需標註符號名稱)(5％)

3. Consider steady, incompressible, parallel, taminar flow of a viscous fluid falling between two infinite vertical walls, as shown in Fig. 3. The distance between the walls is h, and the gravity acts in the negative z-direction. There is no applied pressure driving the flow； that is, the fluid falls by gravity alone. The pressure is constant everywhere in the flow field. Calculate the velocity field.

5. 推導相對濕度與百分濕度之關係式，並說明不同條件下之兩者大小比較 (需標註符號名稱)(5％)

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