# Barometer - basic

• stuc

## Homework Statement ## Homework Equations

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

Last edited:

## Homework Equations

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

## The Attempt at a Solution

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

Show your attempt so we can see where you went wrong. Lets approach this from a physical point of view. What should be equal in both cases, and how does that relate to the density?

Why do the liquid go up into the tube?

• stuc
Pressure acting on both liquids is the same

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

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

• stuc
Boyle Law>?

Boyle Law>?
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.

How do you apply Boyle's Law to a vacuum? Just try the calculation again stuc and show us your results.