(a) A mercury barometer is shown below. A column of mercury is supported by atmospheric pressure pushing at the base. The space at the top of the glass tube is evacuated to vacuum pressure. How tall of a column of mercury does standard atmospheric pressure support? Use kg P ‚= 1.013×105 Pa and the density of mercury is p = 13.6 × 10³ - atm m³
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.
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