(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Hello

This is not a homework, but an example in my textbook that I don't really understand.

We need to find P_{1}

The website I took this picture from explains it but it looks too complicated. The teacher did it moving along the tube and it looked really easy but I didn't understand. He almost did it in his head without using the board.

2. Relevant equations

p_{bottom}= p_{top}+ρgh

the pressure at two points that have the same height are the same if they are connected with the same fluid.

3. The attempt at a solution

Find P_{1}

Here's my try:

P_{E}=P_{air}+ρ_{water}gh_{1}

P_{E}=P_{D}

I don't know how to continue

I know I need to relate P_{D}to the other known quantities but I don't really see how.

Another question: Isn't P_{1}= P_{air}? Since 1 is at the boundary of air and water

Thank you for your help

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# Homework Help: Multifluid manometer

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