) As shown in Figure 10.9 a cylinder is completely filled with water and a force ? applied to the airtight movable piston which forms one end of the cylinder. What force will need to be applied to the piston for the volume of the cylinder to increase by 1 cubic millimetre (which equals 10−9 m3 )? (?water = 2.2 × 109 Pa) (b) If the cylinder was filled with air instead (?air = 1.42 × 105 Pa) what force would be required to increase the volume of air by 1 cubicmillimetre?
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.
10.18 Refer to Figure 10.9 to answer the following questions:
(a) As shown in Figure 10.9 a cylinder is completely filled with water and a force ? applied to the airtight movable piston which forms one end of the cylinder. What force will need to be applied to the piston for the volume of the cylinder to increase by 1 cubic millimetre (which equals 10−9 m3 )? (?water = 2.2 × 109 Pa)
(b) If the cylinder was filled with air instead (?air = 1.42 × 105 Pa) what force would be required to increase the volume of air by 1 cubicmillimetre?
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