- #1

laser

- 104

- 17

- Homework Statement
- See Below

- Relevant Equations
- PV=constant, P_{fluid} = rho*g*h

I am a bit confused on the marking scheme as attached above.

P1V1 is a constant by Boyle's Law. If the volume increases by a factor of 3, then the pressure decreases by a factor of 3.

This means that the pressure at the top is 1/3 the pressure at the bottom, right? The pressure at the top is just atmospheric pressure (1E5 Pa), so the pressure at the bottom must be (3E5 Pa). 3E5 = Pressure due to water + Pressure due to air, so pressure due to water is just 2E5. So 2E5 = rho*g*h.

Is there a flaw in my understanding? Thanks!