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 ?
These density determinations were then used with the gravimetric water content measurements to calculate soil volumetric water content (SVWC).
5 MPa in ceramic pressure plate extractors until drainage ceased, at which time the quantity of water remaining in each sample was determined as a gravimetric water content, w, measured by oven-drying at 105 C for 24 h.
The SWRC was obtained by plotting the gravimetric water content against the pF of the respective soil suction.
When comparing gravimetric water contents, at atmospheric pressure (0 kPa) both clay and biochar amendments significantly increased the water-holding capacity of the soil (P=0.
Gravimetric water content was determined at every 5-m interval of penetrometer measurements at 0-0.
This study was, therefore, designed to (1) evaluate the changes in soil quality parameters (soil temperature, bulk density, soil gravimetric water content, saturated hydraulic conductivity, soil organic carbon content, and total nitrogen) under CT and NT systems, and (2) determine the effects of the tillage systems on the growth and yield of sweet potato.
The 355-g oven-dry soil samples were put into plastic bags and mixed with urea and/or DCD diluted in water, and adjusted to a gravimetric water content of ~0.
Mean bulk density, gravimetric water content, and probe output for a Black Vertosol at Kingsthorpe Gravimetric water cont.
Because of the shrink-swell characteristics of the soil, the neutron probe has been calibrated in terms of gravimetric water content.
Once the calibration data of the driest VWC had been recorded, the gravimetric water content and the bulk density of the soil block were determined.
4 mm/h, respectively) at an initial gravimetric water content of 0.