Consider a Utube whose arms are open to the atmosphere. Now equal volumes of water and light oil (r = 49.3 lbm/ft3) are poured from different arms. A person blows from the oil side of the Utube until the contact surface of the two fluids moves to the bottom of the Utube, and thus the liquid levels in the two arms are the same. If the fluid height in each arm is 30 in, determine the gage pressure the person exerts on the oil by blowing.
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
Consider a Utube
whose arms are open to the atmosphere.
Now equal volumes of water and light oil (r = 49.3
lbm/ft3) are poured from different arms. A person blows from
the oil side of the Utube
until the contact surface of the two
fluids moves to the bottom of the Utube,
and thus the liquid
levels in the two arms are the same. If the fluid height in each
arm is 30 in, determine the gage pressure the person exerts
on the oil by blowing.
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