| http://www.w3.org/ns/prov#value | - In these cases, water is typically present at a concentration from about 1% to 60% by weight, whereas polyhydric alcohol is typically present at a concentration from about 10% to 50% by weight. [0092] As noted above, the electrode interface to the skin may include, instead of or in addition to a hydrogel, a mesh, screen, or other porous material.
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