Meanings of expose to dampness in английском

Jute becomes weak when exposed to dampness.

Nickel-plating should not be exposed to dampness, and must be kept bright by wiping with a soft rag.

It is always preserved through the winter with much difficulty, and almost invariably decays if kept from light and exposed to dampness.

It is believed that the antiscorbutic properties of vegetables are not impaired by desiccation, and they will keep for years if not exposed to dampness.