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 ?
The grower has estimated the gravimetric moisture content of the soil at approximately field capacity (DUL) using a commercial oven or microwave (Gardner 1986) as 0.
Samples were analysed in duplicate and the results corrected for gravimetric moisture content.
23 L of water) to a gravimetric moisture content of 42% approximately 1 h before commencement of the experiment.
In addition, 3 small samples (25 g of soil) were taken from the upper 10 mm of the soil in each of the 2 pots in Box 1 for gravimetric moisture content determination.