GLOSSARY

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HYGROSCOPIC

A material that readily absorbs and retains moisture or water vapour from air. see _humectant_


HYGROTHERMOGRAPH

An instrument used to automatically record and plot changes in humidity and temperature.


HYPERSENSITIVITY

Exaggerated response by the immune system to an allergen.


HYPERSENSITIVITY DISEASES

A group of respiratory diseases, including humidifier fever, which involves inflammation of the lungs following exposure to animal antigens or other biological.


HYPERSENSTIVITY PNEUMONITIS

(extrinsic allergic alveolitis) – A pneumonia-like respiratory disease resulting from acute immune reaction to sensitizing substances, particularly bio sols. It is characterized by the body_s production of large quantities of liquid


HYPHA

An elongated, cylindrical, rod-shaped structure forming the basic fungus structure.


HYPOALLERGENIC

Easily stimulated by allergy causing materials.


HYPOCHLORITE

The active bleaching and disinfecting ingredient in liquid chlorine bleach. see _sodium hypochlorite_


HYSTERISIS

A dependence of the state of a system on its previous history; generally, the retardation or lagging of an effect behind the cause of the effect. In drying, the retardation of the drying effect when the forces acting upon a body of material are slowing down its effectiveness.


IAP

_indoor air pollution_; cp ?IAQ?