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Related to hygroscopic expansion: deliquescent
1. expansion due to the absorption of moisture;
2. in dental casting, the addition of water to the surface of the casting investment during setting to increase the size of the mold.
hy·gro·scop·ic ex·pan·sion(hīgrō-skopik eks-panshŭn)
1. Expansion due to absorption of moisture.
2. In dental casting, addition of water to surface of casting investment during setting to increase the size of the mold.