Hydrostatics

Question 1

Absolute pressure

Answer 1

The actual pressure at a given position is called the absolute pressure, and it is measured relative to absolute zero pressure.

Question 2

Gage pressure

Answer 2

the difference between the absolute pressure and
the local atmospheric pressure (relative pressure).
This difference is called the gage pressure.

Question 3

State the different correlations between gage, absolute, atmospheric and vacuum pressure

Answer 3

Pgage = Pabs - Patm
Pvac = Patm - Pabs

Question 4

Why is pressure independent of x and y coordinates? (dåligt svar, ändra)

Answer 4

For a fluid at rest, the
resultant of all forces acting
on the fluid element is
equal to zero, thus forces along x and y cancel out each other

Question 5

What is special about incompressible fluids?

Answer 5

Density and gravity are constant

Question 6

Stevins Law

Answer 6

All points of a incompressible fluid have the same piezometric head

p=constant surface is a horizontal plane

Question 7

What is a manometer?

Answer 7

A manometer is a device based on the principle that an
elevation change of ∆z in a fluid at rest corresponds to
∆P/ρg. It uses a fluid column to measure pressure
difference.