Heating Capacity Water can absorb and release a relatively large amount of heat with only a modest change in its  own temperature heat.  It lessens the impact of environmental temperature changes , helping to maintain the homeostasis of body temperature.
Solvent Many substances dissolve in water including salts, sugars and oxygen.  Water once it enters the blood stream becomes part of the blood plasma, interstitial fluid and fluid inside the cells of the body.  These fluids are filled with dissolved substances in very precise amounts that are necessary for normal cellular metabolism.  Pure water is rarely found in Nature and the waters of the ocean, lakes and steam always contains dissolved minerals, salts, etc.  Minerals   Ocean Minerals  Blood Plasma

Most of the spa products that we use are mixed with water or are mixed with water before they are used.

Conduction of heat in water Water conducts heat 20 times more effectively than air, therefore, heat loss or gain is much greater when the body is submerged in cold or hot water.  This property of water is used in steam, hydrotub, esthetic and many other spa and wellness treatments.
Water pressure Pressure applied to water causes water to move and create pressure against objects it comes into contact with.  This pressure is used to created hydro-massage in vichy shower treatments, hydrotub, shower, etc.
Osmotic water pressure Movement of water molecules is created when there is a higher concentration of water molecules on one side of a permeable membrane (capillaries) than the other and water moves to create equilibrium on both sides of the membrane.  This movement of water is essential to all living systems at the cellular level.
Buoyancy Objects float in water and how much they float depends on how much water they displace relative to the weight of the object.  Our brain basically floats in the cerebral spinal fluid surrounding the brain.  We use flotation is some hydrotub treatments.  When showing is water buoyancy takes the pressure of gravity off the body.
Lubricant Water is slippery and allows surfaces of some parts of our body to slide against other parts e.g. some joints in the body.
Fluid movement of body It is the fluid, slippery nature of water that allows much of the movement of our body.  Our ability to run, twist, stretch has a great deal to do with the fact that the body is 66% water.
Forms of Water: Ice, Fluid, Vapor Water in the form of ice is used for cooling the body to reduce blood circulation, reduce cellular metabolism, decrease neural transmission.
Water in the form of fluid is used for hydrotub and shower treatments and for its cooling and heating properties.  It is also used for mixing with spa products to prepare them for esthetics and other treatments.
Water in the form of vapor (steam) is used for heating in steam therapy and esthetic treatments.

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