# Pressures on a tube filled with water

#### Idea04

1. Homework Statement

I'm stuck on a problem. If you have a 1'' diameter tube running vertically about 7 feet in the air and 5 feet of the tube was full of water. And at the top of the tube was closed off. And the 2 feet above the water had a vacuum pressure of negative 1 psi.(I don't know vacuum measurements so I put it as a negative psi) Would the water rise upward to the vacuum area. or because the water would have a downward pressure of 3 psi would the water level remain the same.

2. Homework Equations

3. The Attempt at a Solution

Related Introductory Physics Homework Help News on Phys.org

#### Idea04

I'm just wondering because I know if you want to rise water around 34 feet in the air you would have to have a suction force of around 14 psi. Then the water pressure equals the atmospheric pressure. But if you have lets say a bowl of water with a 7 foot pipe running vertically and if the water in the pipe is at 5 feet. It would have a downward force of 3 psi. Now if you had a low vacuum in the pipe, less than 3 psi worth. Would the water rise because of the atmosperic pressure pushing the water upward. Or would the vacuum force be too weak to affect the water.

#### Idea04

Does anyone know the answer to my question.

### Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving