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We can always write $$dh=\left(\frac{\partial h}{\partial T}\right)_P dT+ \left(\frac{\partial h}{\partial P}\right)_T dP;$$ this is just expansion in $T$ and $P$. By definition, $$c_P\equiv\left(\frac{\partial h}{\partial T}\right)_P.$$ Then, we can write $h=g+Ts$ (by definition of $g$) and $dg=-s\,dT+v\,dP$ (the fundamental relation) and thus obtain $$\...


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We made an assumption at the start that $ \tau_{xy} $ means momentum flows in x direction which means the "in" is in the x direction. So as long as "in" is taken in the positive x, y, z direction for appropriate coordinates the analysis w'd be right. Reference Book: Transport Phenomena Textbook by Edwin N. Lightfoot, Robert Byron Bird, ...


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Glass can be very dangerous when it is shattered. Years ago glass on windows should have been banned because it the edges of it could be very sharp like a steak knife. Plexiglass should replace glass especially on windows if someone throws a baseball at a window, so they won't break accidentally.


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Choke is usually just applied to starting fuel/air mix regulation for ICE engines, as far as I'm aware. Throttle is used to actively manage fluid flow while a device is operating. Dampers typically only refer to means of controlling air/exhaust flow in non-ICE, like power plants or HVAC systems. As in your definition a damper is usually just a movable plate ...


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