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Statements

Subject Item
n2:RIV%2F67985858%3A_____%2F10%3A00349147%21RIV11-AV0-67985858
rdf:type
skos:Concept n9:Vysledek
dcterms:description
Nucleation theories typically neglect the influence of the ambient pressure on the condensation of droplets from a supersaturated vapor, despite increasing experimental evidence. We have applied a recently presented model that incorporates this effect to the homogeneous nucleation rates of water at tropospheric conditions. We measured experimental pressure dependent nucleation rates of water in helium at low to intermediate pressures (70-200 kPa) and at temperatures from 240-270 K with the laminar flow diffusion chamber. The observed pressure effect shows a clear positive effect (increasing nucleation rate with increasing pressure) at 270 K and a weaker effect with lower temperatures, consistent with the theory. The experimental pressure effect was more pronounced than predicted by theory. The same principle of the pressure effect should also hold for heterogeneous nucleation of water, which implies that water vapor removal by droplet nucleation of water may be suppressed at tropospheric conditions. Nucleation theories typically neglect the influence of the ambient pressure on the condensation of droplets from a supersaturated vapor, despite increasing experimental evidence. We have applied a recently presented model that incorporates this effect to the homogeneous nucleation rates of water at tropospheric conditions. We measured experimental pressure dependent nucleation rates of water in helium at low to intermediate pressures (70-200 kPa) and at temperatures from 240-270 K with the laminar flow diffusion chamber. The observed pressure effect shows a clear positive effect (increasing nucleation rate with increasing pressure) at 270 K and a weaker effect with lower temperatures, consistent with the theory. The experimental pressure effect was more pronounced than predicted by theory. The same principle of the pressure effect should also hold for heterogeneous nucleation of water, which implies that water vapor removal by droplet nucleation of water may be suppressed at tropospheric conditions.
dcterms:title
How Ambient Pressure Influences Water Droplet Nucleation at Tropospheric Conditions How Ambient Pressure Influences Water Droplet Nucleation at Tropospheric Conditions
skos:prefLabel
How Ambient Pressure Influences Water Droplet Nucleation at Tropospheric Conditions How Ambient Pressure Influences Water Droplet Nucleation at Tropospheric Conditions
skos:notation
RIV/67985858:_____/10:00349147!RIV11-AV0-67985858
n3:aktivita
n7:Z
n3:aktivity
Z(AV0Z40720504)
n3:cisloPeriodika
-
n3:dodaniDat
n13:2011
n3:domaciTvurceVysledku
n12:3883922
n3:druhVysledku
n15:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
262157
n3:idVysledku
RIV/67985858:_____/10:00349147
n3:jazykVysledku
n17:eng
n3:klicovaSlova
nucleations theories; ambient pressure; condensation of droplets
n3:klicoveSlovo
n8:nucleations%20theories n8:ambient%20pressure n8:condensation%20of%20droplets
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[6E9111B4B37D]
n3:nazevZdroje
Geophysical Research Letters
n3:obor
n16:CF
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
4
n3:rokUplatneniVysledku
n13:2010
n3:svazekPeriodika
37
n3:tvurceVysledku
Hyvärinen, A.-P. Lihavainen, H. Brus, David Wedekind, J.
n3:wos
000283941700010
n3:zamer
n10:AV0Z40720504
s:issn
0094-8276
s:numberOfPages
4