In a nutshell, pressure likely does affect relative humidity. However, the difference between atmospheric pressure at different locales likely doesn’t impact humidity to a significant degree. Temperature is the primary factor affecting humidity.

Humidity is the amount of moisture or water present in the air in the form of water vapors. It is measured in grams of water in a letter of air (mass/volume). Relative humidity is the percentage of the moisture against the highest possible level of moisture in the air at a specific temperature.

As humidity increases pressure decreases. Since water vapor is less dense than dry air if both have the same temperature, the addition of water vapor decreases the overall density of the air and lowers its pressure.

Pressure dependence The relative humidity of an air–water system is dependent not only on the temperature but also on the absolute pressure of the system of interest.

Forecasters watch the dew point, not relative humidity, because hot air can hold more moisture than cool air. At 90 degrees, we feel uncomfortable at dew points of 65-69 degrees. But the RH may be only 44 – 52 percent (half the atmosphere’s capacity). Dew points above 70 degrees feel oppressive.

When relative humidity is above roughly 60%, there is a risk of mold growth– with risk really increasing when the RH exceeds 80%. Elevated relative humidity can also lead directly to condensation. When humid air is in contact with a cold surface, it can create moisture or condensation.

Most of us feel comfortable inside our home when the relative humidity remains between 30 and 60 percent. Conversely, when the level is above 60 percent, the air is too wet, which is also harmful to both the home and the homeowners.

High or low temperatures can kill mold spores. There are several methods of removing mold, many of which necessitate the use of harsh chemicals. Temperature change is another way to clean mold. Extreme heat or extreme cold can kill most mold spores.

Darkness Ultraviolet (UV) light from the sun kills most mold and spores, which is why you don’t see it growing outside in the open. Those are the ones that need to be kept dry and free from mold food sources more than areas that get natural sunlight.

Bacteria multiply rapidly between 40 and 140 degrees. Bacteria will not multiply but may start to die between 140 and 165 degrees. Bacteria will die at temperatures above 212 degrees. 2.3: How to Take Food Temperatures Know how to get an accurate reading with your thermometer!

30%-50%