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 ?
A moisture meter with distributed type MT in the form of SICR makes it possible to measure the moisture content of emulsions based on nonpolar liquid dielectrics with lower limit of 10 [cm.sup.3]/[m.sup.3] without preliminary calibration operations.
NFA Administrator Judy Carol Dansal said that they were already accommodating palay with 30-percent moisture content, but due to the lack of drying facilities, they could accept only a minimal volume.
The quality of produce was compromised because of high seed moisture contents at harvest time.
Influence of the wood moisture content on the friction coefficient
After extraction and cleaning, the seeds were dried under ambient conditions until reaching a moisture content of 13.16 [+ or -] 0.17% (d.b).
The aim of the present paper was to evaluate the feasibility of using LIBS for determination of calorific value and moisture content in conditions comparable to industrial ones.
The greater the moisture content, the greater is the creep deformation of the coal sample during the same load stress level.
Figure 1 shows the compression force curves as a function of deformation for the tested moisture content levels.
The reason is that the hydration product Ca[(OH).sub.2] can be dissolved in water for the long-term water immersed test (Figure 13), compared with the moisture content influence test, leading to the decrease of the mechanical parameters of foamed concrete.