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 ?
gravimetric water content by mass) and used for all experiments.
During the experiment, soils were watered by weighing to gravimetric water content of 13% (w/w) daily.
The gravimetric water content was determined according Empresa Brasileira de Pesquisa Agropecuaria (Embrapa, 1997), based on the average of the two moisture samples taken at each depth.
The samples were mixed and split into two subsamples, the first to determine the gravimetric water content (w), and the second to determine the extractable ions and cation exchange capacity (CEC).
Under controlled temperature and equalised gravimetric water content in the laboratory, biochar amendment suppressed soil CO2 emissions by 53 per cent and net soil CO2 eq.
On the same diagram the gravimetric water content W (gravimetric moisture content in percent, the lines leaving the left bottom top) and humidity coefficient (degree) [S.
The SWRC relates changes of gravimetric water content, volumetric water content or saturation of a soil to matric suction.
Surface soil water content in the top 0 to 5 inches and 0 to 8 inches (0 to 12 and 0 to 20 centimeters) of soil was monitored during this transition between crops, using time-domain reflectrometry (TDR) (Hydrosense, Campbell Scientific, Logan, UT) instrumentation that had been calibrated for the experimental soil and gravimetric water content techniques.
Percentage gravimetric water content of pot soils at harvest in relation to the EC of pot soil solution Both EC values and water content values were averages of several replicates of treatments of similar salinity levels irrespective of salt type Average EC (dS/m) % Gravimetric water Unused water of pot soil solution content of pot as a % of soil at harvest field capacity 0.
The gravimetric water content is the mass of water in soil as a percent of the total mass of oven-dry soil:
What is the gravimetric water content (%wt) of a moist soil sample weighing 80g, which has a weight of 65g after oven drying?
1], cv = 7 percent for no-till plots, NS) and gravimetric water content differences existed.