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Pressure is defined as the normal force per unit area.
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The units of pressure are Pascals per square meter in the SI system.
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The penetrating ability of an object depends mainly upon the force rather than just the pressure.
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The pressure in liquid increases with depht
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The force exerted by a static fluid on an object is always perpendicular to the surfaces of the object.
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Atmospheric pressure decreases with increasing altitude.
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Submarines do not usually travel near the bottom of the ocean because pressures are enormous there and would destroy the vessel.
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Any increase in pressure at the surface of a fluid must be transmitted to every other point in the fluid.
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The distribution of pressure in a static liquid makes possible the use of fluids to transmit pressure.
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The pressure at a depth h below the surface of a liquid is proportional to that depth and to the volume of the liquid.
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The fact that the pressure acts in all directions makes possible the transmission of pressure through tubing such as that used for intravenous medication administration.
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In IV apparatus, the pressure at the patient depends on the height of the bottle and on the path taken to reach the patient.
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The use of an air or water mattress helps to prevent the formation of pressure ulcers.
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A brain tumor or any abnormal growth which protrudes into the space normally occupied by the cerebrospinal fluid may cause a measurable decrease in pressure in all parts of the fluid
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The measurement of cerebrospinal fluid pressure is typically made between the third and fourth lumbar vertebrae by means of a spinal manometer.
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Surrounding the fetus is a bag of fluid known as the amniotic sac. Any pressure applied to the abdominal wall will be transmitted to all parts of the fluid and will be exerted upon the fetus.
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Any factor, which under physiological (e.g. compression of jugular veins during a Queckenstedt test) or pathological conditions (brain swelling, space occupying lesion, obstruction of cerebrospinal fluid pathway) disturbs cerebrospinal fluid circulation, may cause an increase in intracranial pressure.
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Since the eye contains an enclosed fluid, any blow to the front of the eye will transmit pressure to the back of the eye and may damage the optic nerve.
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Normally there is enough fluid in the pericardial and pleural cavities to constitute a sizeable enclosed fluid.
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When an object is immersed in water or another fluid, it appears to weigh more than it does in air.
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If the buoyant force is equal to the weight of a submerged object it will float, if the force is less than the weight it will sink.
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Archimedes' principle states that the buoyant force on a submerged object is equal to the volume of the fluid displaced by the object.
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The urine specific gravity normally ranges from 1.001 to 1.030 and is a useful physiological indicator of the ability of the renal tubules to concentrate or dilute the urine.
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The pressure gradient is defined as the pressure drop multiplied by unit length.
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The pressure is transmitted through pipes even if they have turns or coils.
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The friction between the fluid and the walls of the pipe is greater than between two adjacent layers of liquid. Hence, the liquid in the center of the pipe will be travelling faster than that at the edges.
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Plastic tubing material is preferred to rubber lubing because of its greater wall friction effects.
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The viscosty of bood has been found to derease with increasing blood pressure, implying that the flow rate would be more than doubled by doubling the pressure gradient.
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An important application of Archimedes' principle is the hydraulic press.
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The direction of motion of an object submerged in a static fluid is determined only by the densities of the object and the fluid.
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