Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions

2020 ◽  
Author(s):  
Keyword(s):  
Relative Humidity ◽  
Aqueous Solutions ◽  
Constant Relative Humidity

scholarly journals Upper-tropospheric humidity changes under constant relative humidity

2015 ◽  
Vol 15 (20) ◽  
pp. 29497-29521
Author(s):  
K. Gierens ◽  
K. Eleftheratos
Keyword(s):  
Relative Humidity ◽  
Radiative Transfer ◽  
Water Vapour ◽  
Weighting Function ◽  
Scale Height ◽  
Weighted Mean ◽  
Constant Relative Humidity ◽  
Warming Climate ◽  
Upper Tropospheric Humidity ◽  
Peak Emission

Abstract. Theoretical derivations are given on the change of upper-tropospheric humidity (UTH) in a warming climate. Considered view is that the atmosphere, getting moister with increasing temperatures, will retain a constant relative humidity. In the present study we show that the upper-tropospheric humidity, a weighted mean over a relative humidity profile, will change in spite of constant relative humidity. The simple reason for this is that the weighting function, that defines UTH, changes in a moister atmosphere. Through analytical calculations using observations and through radiative transfer calculations we demonstrate that two quantities that define the weighting function of UTH can change: the water vapour scale height and the peak emission altitude. Applying these changes to real profiles of relative humidity shows that absolute UTH changes typically do not exceed 1 %. If larger changes would be observed they would be an indication of climatological changes of relative humidity. As such, an increase in UTH between 1980 and 2009 in the northern midlatitudes as shown by earlier studies using HIRS data, may be an indication of an increase in relative humidity as well.

Operating Micro Fuel Cells at a Constant Relative Humidity

2021 ◽  
Vol MA2021-02 (37) ◽  
pp. 1116-1116
Author(s):  
Nikolaj M. Bielefeld ◽  
Mikkel Jørgensen ◽  
Kristoffer S. Kure ◽  
Rasmus D. Sørensen ◽  
Torsten Berning
Keyword(s):  
Fuel Cells ◽  
Relative Humidity ◽  
Constant Relative Humidity
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