water content

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water content 

Water in a contact lens expressed as a percentage of the total mass of the lens in its hydrated state under equilibrium conditions with physiological saline solution containing 9 g/l sodium chloride at a temperature of 20 ± 0.5ºC and with a stated pH value.
where M is the mass of hydrated lens, m is the mass of dry lens.The US Food and Drug Administration (FDA) has categorized hydrogel contact lenses into four groups according to their water content and their surface reactivity (referred to as ionic if it contains more than 0.2% ionic material, and nonionic otherwise). Group 1: water content less than 50% and non-ionic. Group 2: water content greater than 50% and non-ionic. Group 3: water content less than 50% and ionic. Group 4: water content greater than 50% and ionic.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
The path of moisture getting in and out of the red mud is different at different stages of hydraulic course, so the saturated water content values of red mud have large differences influenced by the courses of moisture absorption and moisture desorption.
where [psi] denotes the suction; w denotes the water content corresponding to the suction; [w.sub.s] is the saturated water content; and a, n, and m are the fitting parameters.
The fitted parameters including saturated hydraulic conductivity, pore size distribution parameter, saturated water content, and residual water content are listed in Table 1 [51].
where [theta] represents the volumetric water content function, [[theta].sub.r] represents the residual water content and [[theta].sub.s] represents the saturated water content. Substituting Eq.
All these problems probably vanished with the UI method, where the bulk soil was not waterlogged and the wetting process included all soil pressure heads from the residual to the saturated water content.
From the steady-state flow experiment, we only estimate porosity (the saturated water content) and longitudinal dispersivity.
Zeleke and Si (2005, 2006) reported scale-dependent variability for hydraulic conductivity and soil water storage at 3 selected matric potentials (saturated water content, field capacity, and residual water).
In this case, the root zone media residing at a deeper depth had slightly larger saturated water content, [[theta].sub.sat], values than for samples near the surface.
where [K.sub.us] is the unsaturated hydraulic conductivity of thawed soil under the condition of saturated unfrozen water content (([[theta].sub.us])), [K.sub.s] is the saturated hydraulic conductivity of thawed soil, and [[theta].sub.s] is the saturated water content of the soil.
Tests were performed on three undisturbed specimens with different initial water contents, starting from the saturated water content or from the natural water content.