# Barometer - basic

• stuc

## 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.