Relative humidity vs Dew point.

pilgrimtex

Gray4lines

kuzi16

pilgrimtex

Rain

kuzi16

madurofan

pilgrimtex

I love this. Puffing 101. Great comments. Thats what a post is for. Yes. a humidor should be at what temp you want and what rh you want. I started this for those who think a certain RH should be the same no matter what the temp. This is false. warm air holds more water vapor. cool air is more dense and cannot hold as much. thats when you have to worry about the rain. A cigar absorbs available moisture that is why you want to maintain a sweet spot of available moisture. No. air can hold 100% RH except maybe in DuBahi. Remember the bench is 70 rh at 70 deg f. the hygrometer will change reading even if the moisture remains the same because it is "RELATIVE" to that temp. Dew point is not a %. RH is what we measure because the instruments we use fit in a humidor and are cheap. If you want to accurately control it get an electronic humidification unit if your box is big enough. Again thanks for the comments and keep em comin.

MVW67

I thought relative humidity was sweat from Kin folk having S E X?? LOL

jgibv

pilgrimtex

Cigary

My head hurts from all of this science...I just know that I keep my temps at 72 in the house and my humis at 65% and it's all good and they smoke great and if smoking cigars ever gets to a point where I need a degree in meteorology to understand how to keep care of them...I'll probably quit.....NOT!

pilgrimtex

johnbharle

Reading through this thread, it occurs to me that I may be one of the few people who live in Texas who do not have AC. Therefore, my home temperature fluctuates widely during the year. I have been concerned for some time that 70% RH is rarely the right amount of moisture for my cigars. But what is? I like the idea that I can have a constant dewpoint in my humidor. Now I know that with a DP of 60, my RH only needs to be at 30% in the summer to keep my cigars humidified (and btw, my RH is often >30% near the Gulf Coast in summer). I think I'll have to draw up a seasonal chart that allows for varying RH dependent on ambient temperature. Thanks, guys!

Vividone

Very intresting thread. I found this calculator http://dpcalc.org/ It seems using the 70/70 rule for long term storage could put your collection at risk for mold using the above calculator.

MIGS_INC

Gray4lines

Lee.mcglynn

Sorry I'm late in this one been really busy!! Dew point and rh play hand in hand but few point wouldn't be a great idea to go and measure with. Kuzi is pretty much correct...dew point is where the temp drops so much and the molecules get smaller to produce moister. To produce moister there has to be 101% humidity since the molecules can not hold anymore and needs to get rid of the rest. Even if it's 20 degrees out with very low humidity if you take something ultra cold it will produce sweat like having a cold beer on a hot day. It might not sweat but you will see ice form on the outside of the container. That is the dew point...rh is just how much moister is in the molecules at what ever temp you choose