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**fluid mechanics....**

Hi,everyone.

I'm doing the second of my mechanical engineering course and I've been doing fluid mechanics lately....I have some questions...could some ony please help me with them?

1.In Bernoulli's theorem,it basically states the if we have an ideal liquid (Newtonian) undergoing steady flow,wherever the velocity increases,the pressure of the liquid decreases. Now,intuitively,does this mean

**"When the liquid starts flowing fast,it doesn't have the time to impose a pressure on the walls of the pipe because it's rapidly flowing away?"**

2.in an inverted differential manometer,how do we find the pressure equation for equilibrium conditions of the maometer liquid?(I mean the net upward pressures on the manometric liquid is it's own weight,isn't it?)

3.Generally,why do we use all these different kinds of manometers...inverted differential manometer,upright differential manometer,etc.?

**Do they have any individual/specific functions?**

4.We often use thermodynamic equations (like the steady flow Energy Equation) for even water and other liquids...but is this permissible?...because in liquids,

**we have to account for inter-molecular atraction,and cannot treat it as an ideal gas**(which we always assume in thermodynamics).