Lecture 2 - Hydrostatics Flashcards
1
Q
What is absolute- , relative- , gage-, and vacuum pressure?
A
Absolute pressure: The actual pressure at at given position
**Relative pressure: **Local atmospheric pressure
Gage pressure: Difference between absolute pressure and relative pressure
Vacuum pressure: Pressure below atmospheric pressure
2
Q
How can you calculate gage- and vacuum pressure?
A
Pgage = Pabs - Patm
Pvac = Patm - Pabs
3
Q
What is the definition of Stewins law?
A
In a fluid at rest there are no shear forces and pressure is isotropic (equal in all directions; invariant under rotation). The pressure at any point in a static fluid acts with the same magnitude in all directions.
4
Q
How do you calculate pressure difference?
A
ΔP =ρgh
