quote:

Originally posted by QM:
A non US vendor that uses the Farenheit temperature scale. Hmmmm.


The vapour pressure values are correct at those temperatures.
Your chart multiplies 70%rh x 18.79 torr = 1315.
It then calculates 1315 / Vp = RH
A statement that cigars will dry out below 60 F.
At 59.9 F the Vp is 13.15 torr so 1350/13.15 = 100% RH
This is not shown in your chart.

So at 100% RH at 59.9 F the cigars will dry out???
That same logic implies that at 212 F cigars will be adequately humidified at 1.7% RH.

Look that whole thing ignores thermodynamic equilibrium.
The equilibrium of water in tobacco, water in air and water as water (or as propylene glycol & water or as water in humidity beads) are all functions of temperature.

As air temperature increases its capacity to hold water increases.
As tobacco temperature decreases its capacity to hold water increases.
Water from a container will purport to air & tobacco in different proportions at different temperatures.
Futhermore as was implied before:
-pure water will tilt the equilibrium toward more water in air and cigars
-water diluted with PG will be less active and purport less to water to the air. It can even remove water from air.
-water in humidity beads will purport less water to the air. It can even remove water.

I have beefed your table to show where some numbers come from.

Temp (C) Temp (F) Vp water (torr) %RH Vp x RH
0.0 32.0 4.58 287.1 1315
13.9 57.0 11.90 110.5 1315
14.4 58.0 12.31 106.8 1315
15.0 59.0 12.79 102.8 1315
15.5 59.9 13.15 100.0 1315
15.6 60.0 13.29 98.9 1315
16.1 61.0 13.72 95.8 1315
16.7 62.0 14.23 92.4 1315
17.0 62.6 14.50 90.7 1315
17.2 63.0 14.71 89.4 1315
17.8 64.0 15.28 86.1 1315
18.0 64.4 15.48 84.9 1315
18.3 65.0 15.80 83.2 1315
18.9 66.0 16.37 80.3 1315
19.0 66.2 16.50 79.7 1315
19.4 67.0 16.95 77.6 1315
20.0 68.0 17.55 75.0 1315
20.6 69.0 18.17 72.4 1315
21.0 69.8 18.70 70.3 1315
21.1 70.0 18.79 70.0 1315
21.7 71.0 19.45 67.6 1315
22.0 71.6 19.80 66.4 1315
22.2 72.0 20.11 65.4 1315
22.8 73.0 20.81 63.2 1315
23.0 73.4 21.10 62.3 1315
23.3 74.0 21.51 61.1 1315
23.9 75.0 22.25 59.1 1315
24.0 75.2 22.40 58.7 1315
24.4 76.0 23.00 57.2 1315
25.0 77.0 23.80 55.3 1315
26.0 78.8 25.20 52.2 1315
27.0 80.6 26.70 49.3 1315
28.0 82.4 28.30 46.5 1315
100.0 212.0 760.00 1.7 1315