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 ?
Furthermore, they stated that, if soil moisture content is above 10%, there was a positive relationship between soil respiration and temperature (p<0.
Temporal soil moisture variability analysis is a complex and dynamic process that generally requires an extensive sample set, resulting in a significant increase in monitoring costs over time.
Experimental Conditions and Manipulation of Soil Moisture Stress Treatments
The best conditions for nitrification and ammonification in sod-podzol soil were as follows: soil temperature of + 15[degrees]C, soil moisture of 20-25%, and soil density of 1.
The following information was recorded for each experimental soil moisture level: 1) the number of eggs deposited per female, 2) the number of days between the time females were placed in cages until the cages were sorted for eggs, i.
Furthermore, we attempted to investigate whether the relationships between CWSI and soil moisture contents differed as changing atmospheric VPD.
He said this information is used with data on canopy and tendril length collected by field scouts and soil moisture content to assess vineyard water status and make any decisions about irrigation each week.
The soil with greater clay content always showed a deviation in [theta] between the 10HS and 5TM sensors and also between the CC and FSC, showing that soil with a high clay content and high [rho]b may cause inaccuracies when measuring soil moisture content with capacitance-based sensors in the field.
In addition, L-band microwave used in the PALSAR has a long wavelength (23 cm) meaning the microwave penetrates plant canopies so that soil moisture is expected to be measured with no influence of plant conditions on the soil surface [15].