Principles of Pressures Flashcards
___ is defined as the force per unit area exerted by the weight of air molecules above the surface.
Atmospheric Pressure
___ is defined as the force per unit area.
Pressure
Which of the following conditions affect the pressure of liquid in a tank?
– Surface pressure, height and density
- height, volume and density
– density, service pressure and volume
– surface pressure, height and volume
Surface pressure, height and density
____ states that pressure of a gas varies inversely with its volume when the gas is held at a constant temperature.
Boyle’s law
If a fixed amount of gas is held in a container with constant volume, raising the temperature of the gas causes the pressure to___.
Go up
___ is the measure of a difference in pressure between two distinct points.
Differential pressure
___ is any pressure between zero and 14.7 psia.
Back pressure
1 Bar equals 14.5 PSI
- 7 in H2O = 1 psi
- 04 in Hg =1 psi
Psia = psia + 14.7 psi
Psia =psia - 14.7 psi
One bar is equal to ___ psi.
14.5
___ states that pressure of a gas varies inversely with its volume when the gas is held at a constant temperature.
Boyle’s law
___ Is the measure of a difference in pressure between two distinct points.
Differential pressure
___ is defined as the force per unit area.
Pressure
Psia is equal to psig ____ atmospheric pressure.
Plus
The following are properties of gas except___.
- Expands to fill volume
- not easily compressible
– easily compressible
– takes shape of container
Not easily compressible
____ is any pressure between zero and 14.7 psia.
Back pressure
