Problem 8: A liquid-filled tube called a manometer can be used to measure the pressure inside a container by comparing it to the atmospheric pressure and measuring the height of the liquid. Such a device (filled with mercury) is shown in the figure, measuring the pressure inside a jar of peanuts. The mercury level on the side of the manometer which is open to the air is 5.1 cm lower than on the side connected to the jar.
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.
Homework 1, Question 8:
Part (a) Find the gauge pressure in the jar, in units of Pa. Assume the density of mercury is 13.5 g/cm3.
Pg = ______
Part (b) Find the absolute pressure in the jar, in units of Pa.
Pabs = ______
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