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 ?
Parameters estimated by Hydrus-1D for coarse dune sand, with a steady state flux applying demineralizd water (1 cm h-1) with 0(v), average soil water content (cm3 cm-3); 0s, saturated water content (cm3 cm-3); , dispersivity (cm); V, pore water velocity (cm h-1) and D, dispersion coefficient (cm2 h-1).
was calculated as the mass-based saturated water content multiplied by the bulk density of the soil (soil bulk density was determined from the volume-mass relationship for each core sample), and the remaining 3 parameters were estimated by nonlinear least-square regression techniques using the Levenberg-Marquardt algorithm (Marquardt 1963).
In this case, the root zone media residing at a deeper depth had slightly larger saturated water content, [[theta].
Water was added to the ring and the TDR water content was monitored until a stable saturated water content reading was obtained.
b] is the boundary water content (the saturated water content in the micropores), [[PSI].
m] [right arrow] 0, Eqn 6 gives a value for the saturated water content, [[theta].
Although 13 months had elapsed since the trial was established, the saturated water content of the WTR-amended treatments was still higher than the control.
s] is the saturated water content, and b is a constant related to the slope of the water retention curve on a log-log scale such that b = 1/[lambda].
Next, the container was removed from the water, the holes at the bottom were closed, and the container was weighed to obtain the saturated water content.
2a, the saturated water content of the sandy soil increased by 20 g [H.