How many water the air can contain depends heavily on air temperature. If the air is cold, it is only a small amount. If the air is hot, it is a lot. So how can you express the humidity in a reasonable way? The standard way is to compare the amount of water in the air to the maximum possible at that temperature. That is relative humidity, and it is expressed in percent.
If you have got an old fashioned hygrometer (containing a hair for measurement), it shows the humidity in percent, too. Wikipedia: Hygrometer <https://en.wikipedia.org/wiki/Hygrometer> To calculate relative humidity from absolute humidity and vice versa there is a formula involving air temperature. WindnFog schrieb am Dienstag, 21. September 2021 um 14:29:20 UTC+2: > Thanks to Vince and Karen. I should have clued in on the % sign on my > Davis Console. I interpret this as relative humidity, at least on a Davis > setup. That brings me to the reason for the question. Should I be reporting > the results on my website graphs and tables as "Relative Humidity," and if > so, is this something that's standard across all weather stations (i.e., a > weewx change), or is it an "It depends on your hardware?" > - Paul VE1DX > > > On 2021-09-20 5:13 p.m., Karen K wrote: > > Relative humidity is in percent. Absolute humidity is in gram per cubic > meter. So you see by the unit what kind of humidity reading it is. "Just > humidity" does not really exist. > > vince schrieb am Montag, 20. September 2021 um 21:27:46 UTC+2: > >> https://www.weathershack.com/products/davis/manuals/6351-manual.pdf says >> relative is what's displayed on the console (see page 20) with another >> mention on page 44 >> >> On Monday, September 20, 2021 at 10:54:31 AM UTC-7 WindnFog wrote: >> >>> >>> I have read the documentation for the Davis Vantage Vue console, weewx, >>> and searched the message board. If the answer is there, I can't find it. >>> Is the humidity that we get relative humidity or just humidity? I know the >>> difference, but I can't seem to find which weewx reports. >>> >>> - Paul VE1DX >>> >> -- > You received this message because you are subscribed to a topic in the > Google Groups "weewx-user" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/weewx-user/wZ3thjZZ-9g/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/weewx-user/cd55fc87-6e67-4258-8998-71a90671f38fn%40googlegroups.com > > <https://groups.google.com/d/msgid/weewx-user/cd55fc87-6e67-4258-8998-71a90671f38fn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/a69db588-e312-4178-a370-3a6536631dfcn%40googlegroups.com.
