# Barometer - basic

1. Nov 9, 2015

### stuc

1. The problem statement, all variables and given/known data

2. Relevant equations
The given ans is 9600 as attached above, but i get 15 000.

3. The attempt at a solution

Last edited: Nov 9, 2015
2. Nov 9, 2015

### billy_joule

Show your attempt so we can see where you went wrong.

3. Nov 9, 2015

### stuc

4. Nov 10, 2015

### Staff: Mentor

Lets approach this from a physical point of view. What should be equal in both cases, and how does that relate to the density?

5. Nov 11, 2015

### andrevdh

Why do the liquid go up into the tube?

6. Nov 11, 2015

### Icy98

Pressure acting on both liquids is the same

7. Nov 11, 2015

### andrevdh

Can you relate the pressure to the height of the column of liquid in the tube?

8. Nov 20, 2015

### andrevdh

Then construct the equation pX = pY for the two liquid columns, that is the two columns are created by the same pressure.

9. Nov 26, 2015

### stuc

Boyle Law>???

10. Nov 26, 2015

### Staff: Mentor

It has nothing to do with Boyle's law. It is actually a simple problem of statics.

andrevdh almost gave you the answer in his replies.

11. Nov 26, 2015

### SteamKing

Staff Emeritus
How do you apply Boyle's Law to a vacuum?

12. Nov 27, 2015

### andrevdh

Just try the calculation again stuc and show us your results.