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Relative Density - The relative density of an object is the ratio of the weight of the object to the weight of an equal volume of water.
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Buoyancy - Aids in rehabilitation of weak muscles and painful joints by reducing weight-bearing on joints.
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Hydrostatic Pressure - Fluid pressure is exerted equally on all surfaces of an immersed body, the deeper a body is immersed the greater the pressure.
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Viscosity - A measure of the frictional resistance of a liquid, this is significantly greater in water than air.
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Surface Tension - Occurs where water meets air and as a result resistance to movement is greater than movement in air alone.
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Temperature - Water temperature can affect rehabilitation, aid relaxation and improve pain management.
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