Every environment has exactly one combination of temperature (T), relative humidity (RH) and dew point (DP). Change any of these variables and you will have a different environment.
Use the DP Calculator to:
- Determine what the Dew Point in your space is – enter the T & RH and solve for DP
- See what combinations of T & RH are possible when you change the DP—the DP determines which temperature will give you which RH
How are T, RH, and DP related?
- At constant Temperature:
The RH and DP will increase or decrease together
- At a constant Relative Humidity:
The T and DP will increase or decrease together
- At a constant Dew Point:
As the T increases, RH decreases
As the T decreases, RH increases
- High temperatures (generally above 75°F/24°C) increase the rate of chemical reactions, which determines how fast or slow organic materials will decay or "naturally age".
- Cool temperatures slow the rate of chemical decay. Lowering the T can improve preservation IF you also maintain an appropriate RH (determined by the dew point).
- At higher temperatures biological activity (insects, mold growth) increases.
- High RH (generally over 65%) can result in mold, metal corrosion, and mechanical damage.
- Low RH (generally below 35%) can result in mechanical damage.
- Wide and frequent RH fluctuations influence the rate of mechanical decay.
- The DP determines which T will give you which RH.