Blaise Pascal duplicated Torricelli's barometer using a red Bordeaux wine, of density 984 kg/m3, as the working liquid (figure below). A long tube is upside-down, with its closed end in the air and its open end submerged in a tank of wine. A column of wine inside the tube extends from the surface level of the wine outside the tube to nearly the top of the tube. The height of the column is labeled h. The pressure outside the tube is labeled P0, and an arrow below the P0 label points down toward the surface of the tank. (a) What was the height h of the wine column for normal atmospheric pressure? m(b) Would you expect the vacuum above the column to be as good as for mercury?
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.
Blaise Pascal duplicated Torricelli's barometer using a red Bordeaux wine, of density 984 kg/m3, as the working liquid (figure below).
m
(b) Would you expect the vacuum above the column to be as good as for mercury?
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