CH E 312 Lecture 6

# CH E 312 Lecture 6 - We learned P = P(z dP =-gdz For...

This preview shows pages 1–5. Sign up to view the full content.

1 P = P(z) dP = - ρ gdz For incompressible fluids ( ρ = constant): z x y We learned... P atm h P = P atm + ρ gh

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2 We learned... P = P atm + ρ gh Density ρ P 1 = P 2 = P 3 1 2 3 Hydrostatic Pressure
3 2.4 Pressure Measurement The pressure at a point within a fluid will be either an absolute pressure or a gage pressure. Absolute pressure is measured relative to a perfect vacuum (absolute zero pressure), Gage pressure is measured relative to the local atmospheric pressure. 𝑃𝑃 𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 = 𝑃𝑃 𝑔𝑔𝑎𝑎𝑎𝑎 − 𝑃𝑃 𝑔𝑔𝑎𝑎𝑎𝑎

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
4 2.4 Pressure Measurement A gage pressure of zero corresponds to a pressure that is equal to the local atmospheric pressure. Absolute pressures are always positive, but gage pressures can be either positive or negative depending on whether the pressure is above atmospheric pressure (positive value) or below atmospheric pressure (negative value). A negative gage pressure is also referred to as a suction or vacuum pressure.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern