What is relative humidity (RH)? It is the quality of the air that ranges between damp and dry. We don’t perceive RH itself, we relate to RH through the dampness or dryness of our bodies in reaction to ambient RH, or we observe the effect on objects such as paper or cloth, which become damp or dry in response to the RH. RH is measured in percentage; 100% humidity is damp and 0% is dry. The different materials in the museum, organic and inorganic, react differently with different RH percentages. Organic materials contain some levels of moisture (eg. wood, paper, paint) and there is moisture on the surface of inorganic materials (eg. metals and stone). It is important to keep in mind that RH and temperature have a distinct relationship: when warmed air is cooled, the RH climbs. This leads to problems of damp when warm humid air finds cool spots in a building. The converse is that when cold air is heated, the RH falls. This leads to low indoor RH in winter, and drives the need for humidifiers. The worst issue dealing with RH is rapid fluctuations in RH percentages. This usually causes the object to expand and contract repeatedly during a short period of time, resulting in serious damage to the object. An example in the museum’s collection of incorrect RH causing severe damage is a Railway Jack. The handle is split down the middle and the metal bottom is all covered in rust. The splitting of the handle is caused by the fluctuations in RH, making the split larger over time if the RH is not controlled. The rust is due to a higher RH percentage over a long period of time, especially because the metal is not coated for protection and is heavily pitted making it easier for the breakdown of the metal.
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