Fluid Statics Flashcards
What is hydro static pressure?
The pressure a fluid exerts on an immersed object or on container walls.
What is the hydrostatic pressure a function of?
The hydrostatic pressure of a stationary, incompressible fluid is a function of vertical depth and density.
What is the equation relating pressure and depth?
Pressure is equal to the product of the density, gravity and depth.
What is pressure independent of?
Its independent of an objects area/size and weight/mass of the fluid above the object.
What is the pressure direction at a point?
Pressure is normal to the surface, regardless of the surface’s shape and orientation.
What are manometers used for?
To measure small pressure differences in fluids.
How do you know if there is a pressure difference in a manometer?
A difference in manometer fluid surface heights.
What is a differential manometer?
When both ends of the manometer are connected to a pressure sources.
What is an open manometer?
If one end of the manometer is open to the atmosphere.
What does an open manometer measure?
It measures gage pressure.
What happens, if one end of the manometer is open to a vacuum?
The manometer measures absolute pressure.
How is the pressure difference calculated in a manometer?
Start with the pressure on one side and the add or subtract changes in hydro static pressure at known points along the column until the pressure on the other side is reached.
What are barometers used for?
Its a device used for measuring the absolute pressure of the atmosphere.
What other fluid factor effects the reading of a barometer?
The vapor pressure of the fluid effects the barometer reading which can be neglected for certain fluids.
How does the fluid vapor pressure effect the pressure equation?
The vapor pressure is added.
