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.
References in periodicals archive ?
s] are the residual and saturated water contents ([L.
Saturated water contents are consistently smaller for field-derived values than laboratory values; the only exception is layer four for both lysimeters.
Zeleke and Si (2005, 2006) examined the scaling property of saturated hydraulic conductivity, measured saturated water content, residual soil water content, and field capacity.
The laboratory measurements of saturated water content for the topsoil were significantly greater than the field measurements and had a smaller variation between replicates (Table 1).
By normalising the water retention curve to saturated water content, most of the scatter was removed (Fig.
For the Moora sand, the air entry was the most variable parameter with up to 60% coefficient of variation followed by the residual water content with 19%, the saturated water content with 7%, and the n parameter with 5%.
Saturated hydraulic conductivity was estimated from the regression equation developed by the unsaturated hydraulic conductivity data of each plot, corresponding the saturated water content and the report of Bruce et al.
Equation 18 then results in the IWC being equal in magnitude to the saturated water content, as it should be.
In December 1999, 3 months after this field experiment was established, the saturated water content of the control treatment was 0.
Owing mainly to the low bulk density of the WTR, its high stability (because of the sustained performance of the polymer), and limited potential for swelling, the saturated water content and [K.
The slope corresponds to a rate of increase in the saturated water content of aggregates of 9.
The line through the 3 points had a slope corresponding to an increase in the saturated water content of 10 g [H.