A sliding wire device used for measuring surface tension is shown in the figure below. The device exerts a force to reduce the film's surface area. The force needed to hold the wire in place is F = yL = y(20), since there are two liquid surfaces attached to the wire. This force remains nearly constant as the film is stretched, until the film approaches its breaking point. Calculate the force (in N) on the slide wire the figure below if it is 3.45 cm long and the fluid is water at 0°C. Film surfaces XN Side view Wire F = y(2) e
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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