TokyoB wrote:I would think that it is not only RH that matters but also temperature. That is at 70 RH, for example, the amount of water in the air will be much higher at 30C than 20C. I presume that the reason Kunming cakes are so dry, even at 70RH, is the lower temperature.
I think the relationship between humidity (vapour density) and temperature goes something like this:
The more heat (energy) held in the air, the less likely the water molecules are to condense out (dew point) as the molecules have more kinetic energy, are moving around more and less likely to bond with each other, so the humidty (saturation vapour pressure) is higher.
Air at 35 centigrade has double the saturation vapour density as air at 20 centigrade. i.e. double the maximum amount of moisture/cubic metre, so 70% RH humidity in Kunming means its still a lot 'dryer' than 70% humidity in Jinghong.