Pressure is defined by many units. The most common are based on measuring the length of mercury in inverted tubes where the atmospheric pressure pushes back against gravity until the two forces are balanced. This is seen in units like millimeters of mercury (mmHg) or inches of mercury (inHg); the latter of the two only really used in the US and one or two other countries. Another unit used in the US (especially for tire pressure) is pounds per square inch (PSI). Think about the definition of pressure and describe why PSI actually is the most accurate unit for pressure
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.
- Pressure is defined by many units. The most common are based on measuring the length of mercury in inverted tubes where the atmospheric pressure pushes back against gravity until the two forces are balanced. This is seen in units like millimeters of mercury (mmHg) or inches of mercury (inHg); the latter of the two only really used in the US and one or two other countries.
Another unit used in the US (especially for tire pressure) is pounds per square inch (PSI). Think about the definition of pressure and describe why PSI actually is the most accurate unit for pressure.
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