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 porosity increase at constant gravimetric moisture content reduces the percentage of moisture in comparison with a gas component.
The clean seeds were weighed and a portion sub-sampled for gravimetric moisture content seed dry weight determination.
However, information is also needed on the shrinkage curve of the soil (the relationship between gravimetric moisture content and the bulk density) to account for changes caused by the shrink-swell process.
On the other hand, the fertility of the Brinsley site is low, with a hardsetting surface and low gravimetric moisture content, clay, organic C and N, and free iron.
The gravimetric moisture content ([theta]g) was determined by oven-drying subsamples at 105[degrees]C for 24 h.
Gravimetric moisture content ([theta]g) was determined at each site by oven-drying subsamples at 105[degrees]C for 24 h.