Relative humidity effects distributions

RH Function Based on Pore Distribution. Anotherway of expressing the relative humidity effect on metal migration is derived from the assumption that a surface or an interface between a film and a substrate can be imagined as consisting of a log-normally distributed pore-network in which water condensation will first occur in the smaller pores as the... 

Point measurement, requires assumption of homogeneous distribution of particles neglects extinction from absorption, coarse particles (>3-10 fim must consider humidity effects at high relative humidity... 

Sverdrup, G. M., and K. T. Whitby, The Effect of Changing Relative Humidity on Aerosol Size Distribution Measurements, Adr. Environ. Sci, Technoi, 10, 527-538 (1980a). 

Clearly, such experiments can be used to examine the relationship between primary emissions and the formation of a host of secondary pollutants. For example, runs can be carried out at varying initial concentrations of hydrocarbon and NO, and the effects on the formation of secondary pollutants such as 03 studied. The reactivity of various hydrocarbons can be examined by studying them singly or in combination. In addition, such parameters as temperature, relative humidity and total pressure, presence of copollutants, and spectral distribution of the light source can be systematically varied. 

Although structurally Kevlar fibres are highly crystalline or ordered it is interesting to note that appreciable moisture is absorbed at equilibrium. For example in variant T950 the moisture uptake is about 5 % at 22 °C and 55 % relative humidity. As discussed in Sect. 4.1.4.1 it is likely that the water is retained in microvoids distributed close to the surface of the fibres. Certainly in the short term there appears to be little effect of moisture on the tensile properties. 

Analysis of the breakthrough dynamics for TBB and DMMP on carbon beds with different amounts of pre-adsorbed NaCl and different air stream relative humidity, shows that NaCl exhibits deleterious effects at any humidity. However, at low amounts of NaCl these effects are insignificant. This can be caused by the distribution of NaCl at the entrances of pores, reducing penetration of organics into pores. At low NaCl contents, its negative effects are stronger for DMMP than for TBB. 

For binary solutions such as sulfuric acid and water, droplets may be distributed with respect to size, but at equilibrium all have the same composition unless the Kelvin effect is important as discussed in a later section. For ternary mixtures, the situation is more complicated the same droplet size may result from different chemical compositions in equilibrium at a given relative humidity. 

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